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PubMed2004

A systematic review of the incidence of schizophrenia: the distribution of rates and the influence of sex, urbanicity, migrant status and methodology.

BACKGROUND: Understanding variations in the incidence of schizophrenia is a crucial step in unravelling the aetiology of this group of disorders. The aims of this review are to systematically identify studies related to the incidence of schizophrenia, to describe the key features of these studies, and to explore the distribution of rates derived from these studies. METHODS: Studies with original data related to the incidence of schizophrenia (published 1965-2001) were identified via searching electronic databases, reviewing citations and writing to authors. These studies were divided into core studies, migrant studies, cohort studies and studies based on Other Special Groups. Between- and within-study filters were applied in order to identify discrete rates. Cumulative plots of these rates were made and these distributions were compared when the underlying rates were sorted according to sex, urbanicity, migrant status and various methodological features. RESULTS: We identified 100 core studies, 24 migrant studies, 23 cohort studies and 14 studies based on Other Special Groups. These studies, which were drawn from 33 countries, generated a total of 1,458 rates. Based on discrete core data for persons (55 studies and 170 rates), the distribution of rates was asymmetric and had a median value (10%-90% quantile) of 15.2 (7.7-43.0) per 100,000. The distribution of rates was significantly higher in males compared to females; the male/female rate ratio median (10%-90% quantile) was 1.40 (0.9-2.4). Those studies conducted in urban versus mixed urban-rural catchment areas generated significantly higher rate distributions. The distribution of rates in migrants was significantly higher compared to native-born; the migrant/native-born rate ratio median (10%-90% quantile) was 4.6 (1.0-12.8). Apart from the finding that older studies reported higher rates, other study features were not associated with significantly different rate distributions (e.g. overall quality, methods related to case finding, diagnostic confirmation and criteria, the use of age-standardization and age range). CONCLUSIONS: There is a wealth of data available on the incidence of schizophrenia. The width and skew of the rate distribution, and the significant impact of sex, urbanicity and migrant status on these distributions, indicate substantial variations in the incidence of schizophrenia.

Cohort Studies↗
PubMed2005

A systematic review of the prevalence of schizophrenia.

BACKGROUND: Understanding the prevalence of schizophrenia has important implications for both health service planning and risk factor epidemiology. The aims of this review are to systematically identify and collate studies describing the prevalence of schizophrenia, to summarize the findings of these studies, and to explore selected factors that may influence prevalence estimates. METHODS AND FINDINGS: Studies with original data related to the prevalence of schizophrenia (published 1965-2002) were identified via searching electronic databases, reviewing citations, and writing to authors. These studies were divided into "core" studies, "migrant" studies, and studies based on "other special groups." Between- and within-study filters were applied in order to identify discrete prevalence estimates. Cumulative plots of prevalence estimates were made and the distributions described when the underlying estimates were sorted according to prevalence type (point, period, lifetime, and lifetime morbid risk). Based on combined prevalence estimates, the influence of selected key variables was examined (sex, urbanicity, migrant status, country economic index, and study quality). A total of 1,721 prevalence estimates from 188 studies were identified. These estimates were drawn from 46 countries, and were based on an estimated 154,140 potentially overlapping prevalent cases. We identified 132 core studies, 15 migrant studies, and 41 studies based on other special groups. The median values per 1,000 persons (10%-90% quantiles) for the distributions for point, period, lifetime, and lifetime morbid risk were 4.6 (1.9-10.0), 3.3 (1.3-8.2), 4.0 (1.6-12.1), and 7.2 (3.1-27.1), respectively. Based on combined prevalence estimates, we found no significant difference (a) between males and females, or (b) between urban, rural, and mixed sites. The prevalence of schizophrenia in migrants was higher compared to native-born individuals: the migrant-to-native-born ratio median (10%-90% quantile) was 1.8 (0.9-6.4). When sites were grouped by economic status, prevalence estimates from "least developed" countries were significantly lower than those from both "emerging" and "developed" sites (p = 0.04). Studies that scored higher on a quality score had significantly higher prevalence estimates (p = 0.02). CONCLUSIONS: There is a wealth of data about the prevalence of schizophrenia. These gradients, and the variability found in prevalence estimate distributions, can provide direction for future hypothesis-driven research.

Epidemiologic Studies↗
PubMed2005

A systematic review of diagnostic utility of selective nerve root blocks.

BACKGROUND: Transforaminal epidural injections, or selective nerve root blocks, are used for a myriad of different spinal disorders. A clear consensus on the use of selective nerve root injections as a diagnostic tool does not currently exist. Additionally, the effectiveness of this procedure as a diagnostic tool is not clear. OBJECTIVE: The objective was to evaluate the accuracy of selective nerve root injections in diagnosing spinal disorders. STUDY DESIGN: The study involved a systematic review of diagnostic studies about selective nerve root blocks for the diagnosis of spinal pain. METHODS: A systematic review of the literature for clinical studies was performed to assess the accuracy of selective nerve root injections in diagnosing spinal disorders. Methodologic quality evaluation was performed utilizing AHRQ and QUADAS criteria. The methodology of the studies was graded and the evidence was classified into five levels: conclusive, strong, moderate, limited, or indeterminate. RESULTS: There is limited evidence on the effectiveness of selective nerve root injections as a diagnostic tool in spinal disorder. There is insufficient research into this area for strong support, but the available literature is supportive of selective nerve root injections as a diagnostic test in equivocal radicular pain. The current analysis provides moderate evidence of transforaminal epidural injections in the preoperative evaluation of patients with negative or inconclusive imaging studies. CONCLUSIONS: Selective nerve root injections may be helpful as a diagnostic addition in evaluating spinal disorders with radicular features, but the role of this diagnostic test needs to be further clarified by additional research and consensus on technique.

Journal Article↗
PubMed2005

Systematic reviews of health effects of social interventions: 2. Best available evidence: how low should you go?

STUDY OBJECTIVE: There is little guidance on how to select the best available evidence of health effects of social interventions. The aim of this paper was to assess the implications of setting particular inclusion criteria for evidence synthesis. DESIGN: Analysis of all relevant studies for one systematic review, followed by sensitivity analysis of the effects of selecting studies based on a two dimensional hierarchy of study design and study population. SETTING: Case study of a systematic review of the effectiveness of interventions in promoting a population shift from using cars towards walking and cycling. MAIN RESULTS: The distribution of available evidence was skewed. Population level interventions were less likely than individual level interventions to have been studied using the most rigorous study designs; nearly all of the population level evidence would have been missed if only randomised controlled trials had been included. Examining the studies that were excluded did not change the overall conclusions about effectiveness, but did identify additional categories of intervention such as health walks and parking charges that merit further research, and provided evidence to challenge assumptions about the actual effects of progressive urban transport policies. CONCLUSIONS: Unthinking adherence to a hierarchy of study design as a means of selecting studies may reduce the value of evidence synthesis and reinforce an "inverse evidence law" whereby the least is known about the effects of interventions most likely to influence whole populations. Producing generalisable estimates of effect sizes is only one possible objective of evidence synthesis. Mapping the available evidence and uncertainty about effects may also be important.

Automobile Driving↗
PubMed2000

Systematic reviews of injury-prevention strategies for occupational injuries: an overview.

BACKGROUND: Information on which strategies have been shown to be effective, which are ineffective, and which strategies have been inadequately evaluated is important for both public policy and future research. OBJECTIVE: The objective of this study was to provide systematic reviews of the literature on important strategies to prevent occupational, including agricultural, injuries. METHODS: The Injury Control Research Centers (ICRCs) funded by the National Center for Injury Prevention and Control (NCIPC), Centers for Disease Control and Prevention, and Centers for Agricultural Injury funded by the Division of Safety Research, the National Institute for Occupational Safety and Health (NIOSH), Centers for Disease Control and Prevention, identified 12 important occupational and agricultural injury-prevention strategies or areas of research. Systematic reviews of the literature were conducted to identify relevant controlled trials and studies. These were critically reviewed and summarized. RESULTS: A total of 12 reviews were conducted on a range of topics in the occupational injury field. Few randomized controlled trials were found; most controlled studies were either comparisons over time and/or across different populations. In several areas we were limited to summarizing the descriptive literature. Nevertheless, summaries of these studies provide meaningful conclusions about the effectiveness of various interventions to decrease morbidity and mortality from selected occupational and agricultural injuries. CONCLUSIONS: A large body of literature on occupational, public health, or injury prevention interventions exists. The summary of this literature provides a framework to both direct policy and guide future research efforts.

Accidents, Occupational↗
PubMed2000

A systematic review of workplace interventions to prevent low back pain.

A systematic review of randomised controlled trials was undertaken to evaluate the effectiveness of workplace interventions to prevent low back pain. Potential trials were located by a computerised search supplemented with citation tracking. The methodological quality of the trials was assessed on 11 criteria and the level of evidence for each intervention was determined, based upon the amount, consistency and quality of evidence from the trials. The review located 13 trials that were generally of moderate quality. The trials suggest that work place exercise is effective, braces and education are ineffective, and workplace modification plus education is of unknown value in preventing low back pain.

Journal Article↗
PubMed2001

Systematic reviews of selected dental caries diagnostic and management methods.

A systematic review of the English-language literature was conducted to address three related questions concerning the diagnosis and management of dental caries: a) the performance (sensitivity, specificity) of currently available diagnostic methods for carious lesions, b) the efficacy of approaches to the management of noncavitated or initial carious lesions, and c) the efficacy of preventive methods among individuals who have experienced or are expected to experience elevated incidence of carious lesions. From 1,328 caries diagnostic and 1,435 caries management reports originally identified, thirty-nine diagnostic studies and twenty-seven management studies were included in the final evidence tables. Point estimates or reasonable range estimates for the diagnostic validity of methods for the diagnosis of carious lesions could not be established from the literature reviewed. There are insufficient numbers of reports of diagnostic performance involving primary teeth, anterior teeth, and root surfaces. For posterior occlusal and proximal surfaces, quality issues and the variation among studies precludes establishing such estimates. The apparent differences in sensitivity among methods are generally smaller than the variation reported within methods. The literature on the management of noncavitated carious lesions consisted of five studies describing seven experimental interventions. Because these interventions varied extensively in terms of management methods tested as well as other study characteristics, no conclusions about the efficacy of these methods were possible. The literature on the management of individuals at elevated risk of carious lesions consisted of twenty-two studies describing twenty-nine experimental interventions. The strength of the evidence for the efficacy of fluoride varnish for prevention of dental caries in high-risk subjects was fair, and the evidence for all other methods was incomplete. Because the evidence for efficacy for some methods, including chlorhexidine, sucrose-free gum, and combined chlorhexidine-fluoride methods, is suggestive but not conclusive, these interventions represent fruitful areas for further research.

Anti-Infective Agents, Local↗
PubMedDate not supplied

A systematic review of the prevalence of Chlamydia trachomatis among European women.

The study aim was to establish by systematic review the prevalence of asymptomatic Chlamydia trachomatis infection of the lower female genital tract in Europe and also to assess the extent and effect of screening. The search process was wide ranging, using the electronic databases Medline, Embase and Aidsline and the Internet using the search engines Netscape and Euro-ferret. Studies published in any language during 1980-2000 were included if they unambiguously reported prevalence of C. trachomatis infection in asymptomatic women, and were assessed qualitatively. From >300 papers which quantified C. trachomatis urogenital infection, only 14 studies met the inclusion criteria: four from the UK, two from Sweden, two from The Netherlands, and one each from Bulgaria, France, Finland, Hungary, Italy and Spain. In only one study had screening taken place. The prevalence of C. trachomatis in unscreened asymptomatic women in Europe ranges from 1.7 to 17% depending upon the setting, context and country. The mode was -6% for women seeking contraception, and 4% for women having cervical smears. In conclusion, this review confirms high prevalence rates of C. trachomatis infection among asymptomatic women in many European settings.

Chlamydia Infections↗
PubMed2000

The effect of oral N-acetylcysteine in chronic bronchitis: a quantitative systematic review.

The role of N-acetylcysteine (NAC) in the treatment of chronic bronchitis is unclear. Since a number of studies have been published on this topic, a systematic review of published studies seems justified. A systematic search (Medline, Embase, Cochrane Library, bibliographies, no language restriction) for published randomized trials comparing oral NAC with placebo in patients with chronic bronchitis was performed. Dichotomous data on prevention of exacerbation, improvement of symptoms and adverse effects were extracted from original reports. The relative benefit and number-needed-to-treat were calculated for both individual trials and combined data. Thirty-nine trials were retrieved; eleven (2,011 analysed patients), published 1976-1994, were regarded as relevant and valid according to preset criteria. In nine studies, 351 of 723 (48.5%) patients receiving NAC had no exacerbation compared with 229 of 733 (31.2%) patients receiving placebo (relative benefit 1.56 (95% confidence interval (CI) 1.37-1.77), number-needed-to-treat 5.8 (95% CI 4.5-8.1). There was no evidence of any effect of study period (12-24 weeks) or cumulative dose of NAC on efficacy. In five trials, 286 of 466 (61.4%) patients receiving NAC reported improvement of their symptoms compared with 160 of 462 (34.6%) patients receiving placebo (relative benefit 1.78 (95% CI 1.54-2.05), number-needed-to-treat 3.7 (95% CI 3.0-4.9)). With NAC, 68 of 666 (10.2%) patients reported gastrointestinal adverse effects compared with 73 of 671 (10.9%) taking placebo. With NAC, 79 of 1,207 (6.5%) patients withdrew from the study due to adverse effects, compared with 87 of 1,234 (7.1%) receiving placebo. In conclusion, with treatment periods of approximately 12-24 weeks, oral N-acetylcysteine reduces the risk of exacerbations and improves symptoms in patients with chronic bronchitis compared with placebo, without increasing the risk of adverse effects. Whether this benefit is sufficient to justify the routine and long-term use of N-acetylcysteine in all patients with chronic bronchitis should be addressed in further studies and cost-effectiveness analyses.

Acetylcysteine↗
PubMed2005

Cervical screening programmes: can automation help? Evidence from systematic reviews, an economic analysis and a simulation modelling exercise applied to the UK.

OBJECTIVES: To assess the effectiveness and cost-effectiveness of adding automated image analysis to cervical screening programmes. DATA SOURCES: Searching of all major electronic databases to the end of 2000 was supplemented by a detailed survey for unpublished UK literature. METHOD: Four systematic reviews were conducted according to recognised guidance. The review of 'clinical effectiveness' included studies assessing reproducibility and impact on health outcomes and processes in addition to evaluations of test accuracy. A discrete event simulation model was developed, although the economic evaluation ultimately relied on a cost-minimisation analysis. RESULTS: The predominant finding from the systematic reviews was the very limited amount of rigorous primary research. None of the included studies refers to the only commercially available automated image analysis device in 2002, the AutoPap Guided Screening (GS) System. The results of the included studies were debatably most compatible with automated image analysis being equivalent in test performance to manual screening. Concerning process, there was evidence that automation does lead to reductions in average slide processing times. In the PRISMATIC trial this was reduced from 10.4 to 3.9 minutes, a statistically significant and practically important difference. The economic evaluation tentatively suggested that the AutoPap GS System may be efficient. The key proviso is that credible data become available to support that the AutoPap GS System has test performance and processing times equivalent to those obtained for PAPNET. CONCLUSIONS: The available evidence is still insufficient to recommend implementation of automated image analysis systems. The priority for action remains further research, particularly the 'clinical effectiveness' of the AutoPap GS System. Assessing the cost-effectiveness of introducing automation alongside other approaches is also a priority.

Automation↗
PubMed2026

Postoperative complications and outcomes after surgical treatment for tophaceous gout: A systematic review and meta-analysis.

BACKGROUND: Surgical treatment remains necessary for selected patients with tophaceous gout, particularly when mechanical limitation, nerve compression, ulceration, infection, deformity, or failure of conservative treatment is present. However, postoperative outcomes after surgery for tophaceous gout have not been comprehensively quantified. This systematic review and meta-analysis evaluated postoperative complication profiles and recurrence burden after surgical treatment for tophaceous gout. METHODS: A systematic search of PubMed, Embase, Web of Science, and the Cochrane Library was conducted from database inception to March 25, 2026. Original studies reporting postoperative outcomes after surgical treatment for tophaceous gout were included. Pooled event rates with 95% confidence intervals (CIs) were calculated using a random-effects single-arm meta-analytic approach. Primary outcomes were postoperative infection, delayed wound healing, and recurrence. Secondary outcomes were reoperation, amputation, and overall complications. Functional outcomes were summarized descriptively. RESULTS: 18 retrospective studies were included. The pooled postoperative infection rate was 11.3% (95% CI 8.0%-15.7%), delayed wound healing 9.9% (95% CI 5.1%-18.2%), and recurrence 8.5% (95% CI 4.7%-14.9%). Secondary pooled rates were 9.7% (95% CI 5.5%-16.7%) for reoperation, 3.7% (95% CI 2.0%-6.8%) for amputation, and 24.0% (95% CI 14.0%-38.1%) for overall complications. Significant subgroup differences were identified only for infection according to anatomic site and intervention type. Sensitivity analyses showed that pooled estimates were robust. The certainty of evidence was very low for all outcomes. CONCLUSIONS: Surgical treatment for tophaceous gout is associated with measurable postoperative risks, particularly infection and overall complications. These findings support careful perioperative counseling, structured postoperative surveillance, integrated long-term urate-lowering management, and more standardized reporting of perioperative risk factors and postoperative outcomes in future surgical studies of tophaceous gout.

Humans↗
PubMed2003

Radix Sophorae flavescentis for chronic hepatitis B: a systematic review of randomized trials.

To evaluate the effects of radix Sophorae fiavescentis for chronic hepatitis B, a systematic review of randomized clinical trials was conducted. Randomized trials comparing extract of radix Sophorae flavescentis versus placebo, no intervention, non-specific treatment, other active medicines, or interferon for chronic hepatitis B were identified by electronic and manual searches. Trials of Sophorae herb plus other drugs versus other drugs alone were also included. No blinding and language limitations were applied. The methodological quality of trials was assessed by the Jadad scale plus allocation concealment. Meta-analysis was performed where data was available. Twenty-two randomized trials (n = 2409) were included. Methodological quality of the trials was generally low. The combined results showed that matrine (aqueous extract of Sophorae flavescentis) had antiviral activity, positive liver biochemical effects, and improved symptoms and signs compared with non-specific treatment and other herbal medicines. The combination of matrine and interferon-alpha (IFN-alpha), thymosin, or basic treatment showed better effects on viral and liver biochemical responses. The antiviral and biochemical responses were not significantly different between matrine and IFN-alpha. No serious adverse event was reported. Based on the review, Sophorae flavescentis extract (matrine) may have antiviral activity and positive effects on liver biochemistry in chronic hepatitis B. However, the evidence is not sufficient to recommend matrine for routine clinical use due to the generally low methodological quality of the studies. Further rigorous trials are needed.

Alkaloids↗
PubMed2005

Clinical efficacy of OM-85 BV in COPD and chronic bronchitis: a systematic review.

OM-85 BV is an immunomodulatory agent used for prevention of exacerbations in persons with chronic lung disease. We conducted a systematic review of OM-85 BV to evaluate its efficacy and safety. A systematic search for relevant articles was performed. Studies were included if they involved persons with chronic obstructive pulmonary disease or chronic bronchitis and were randomized to OM-85 BV or placebo. Investigators extracted data on study design, participant characteristics, and clinical outcomes. Thirteen trials involving 2066 individuals met inclusion criteria. Three trials enrolled an older, more homogenous population with chronic obstructive pulmonary disease. Utilizing quantitative pooled analysis in these studies, with one or more acute exacerbations as the endpoint, we found a non-statistically significant trend in favor of OM-85 BV [relative risk 0.83, 95% confidence interval 0.65-1.05]. Ten trials enrolled a heterogeneous population with chronic bronchitis. In these trials, exacerbation rates were less with OM-85 BV in 4 of 9 trials reporting this outcome. Varied results in the outcomes of hospitalization, symptom scores, and antibiotic or steroid use were found across studies. Withdrawals and adverse events were similar between OM-85 BV and placebo. While OM-85 BV is used to prevent exacerbations in persons with chronic lung disease, consistent evidence across multiple important outcomes does not exist to clearly demonstrate clinical benefit. Further randomized controlled trials enrolling large numbers of persons with well-defined COPD are necessary to confirm the effectiveness of this agent.

Adjuvants, Immunologic↗
PubMed2005

Liver transplantation and hepatitis C virus: systematic review of antiviral therapy.

Antiviral therapy for recurrent hepatitis C after liver transplantation is increasingly used. This systematic review presents both viral and histological response in three areas: pretransplant (5 studies/180 patients), preemptive therapy soon after transplant (10 studies/417 patients), and therapy for established disease (75 studies/2027 patients). There were only 16 randomized studies (543 patients). Significant dose reductions and drug stoppage rates occurred. The data on histological improvement and risk of rejection are conflicting. Even the best antiviral therapy (pegylated interferon/ribavirin) is neither easily used nor reasonably effective. The best strategy will be pretransplant treatment, most likely with newer agents.

Antiviral Agents↗
PubMed2006

Maternal position during the first stage of labor: a systematic review.

BACKGROUND: Policy makers and health professionals are progressively using evidence-based rationale to guide their decisions. There has long been controversy regarding which maternal position is more appropriate during the first stage of labor. This problem has been examined often and repeatedly and the optimal recommendation remains unclear. METHODS: This is a systematic review of the effect of maternal position during the first stage of labor. The main question addressed here is: Does encouraging women to adopt an upright position or to ambulate during the first stage of labor reduce the duration of this stage? All randomized controlled trials carried out to assess this effect were taken into consideration in this review. The following electronic databases were accessed to identify studies: MEDLINE, Popline, the Scientific Electronic Library On-line and the Latin American and Caribbean Health Science Information. Citation eligibility was independently assessed by two reviewers. The methodological quality of each trial was also evaluated independently by two reviewers and a trial under consideration was included only when consensus had been attained. Allocation concealment and screening for the occurrence of attrition, performance and detection biases were considered when studies were appraised. The decision whether to perform data pooling was based on the clinical similarity of studies. RESULTS: The search strategy resulted in 260 citations, of which 18 were assessed in full-text. Nine eligible randomized controlled trials were included in the systematic review. Randomization methods were not fully described in eight studies. The allocation concealment was considered adequate in four studies and unclear in five. The investigators pooled the data from seven studies in which the length of the first stage of labor and results were in favor of the intervention, but the high level of heterogeneity (I2 = 88.4%) impaired the meaning of this finding. The intervention did not affect other outcomes studied (mode of delivery, use of analgesia, labor augmentation and condition of the child at birth). CONCLUSION: Adoption of the upright position or ambulation during first stage of labor may be safe, but considering the available evidence and its consistency, it cannot be recommended as an effective intervention to reduce duration of the first stage of labor.

Journal Article↗
PubMed2006

Improving compliance in depression: a systematic review of narrative reviews.

BACKGROUND AND OBJECTIVE: Narrative reviews represent a popular source of information for clinicians, especially where the evidence on a given subject is sparse and analogies from other fields of medicine may help in filling the information gap. Unfortunately, narrative reviews often follow less stringent criteria for information selection and appraisal than systematic reviews, potentially leading to incomplete or biased recommendations. The objective of the present study was to examine the quality of the recommendations provided by narrative reviews on how to improve patient adherence to pharmacological treatment of unipolar depressive disorders. METHOD: We sought to locate all narrative review papers addressing adherence to treatment in unipolar depressive disorders. In order to do so, we searched Medline and PsychInfo from 1980 to December 2003, using the following keywords: review, depressive disorders, treatment, dropout, patient compliance and adherence. We inspected the title and the abstract, whenever available to identify the relevant reviews and obtained a full copy of the publications in this subset, and read the articles to identify further relevant reviews. These were in turn copied and reviewed, until no further references were found. RESULTS AND DISCUSSION: We identified 23 reviews, providing a total of 87 recommendations. The most common recommendation was for patient education (19 times), patient-physician empathy/alliance (14 times), and education of family (nine times). Reviewers' recommendations were based on the literature on depression 54 times, and on other medical conditions 17 times. A critical appraisal of the evidence base of the recommendations showed that randomized controlled trials or meta-analyses were quoted to support the recommendations only 23% of the times, while important interventions of proven efficacy in the field of depression or in other chronic conditions (e.g. medication clinics, training of nurses, psychological treatment, and telephone follow-up) were not mentioned. CONCLUSIONS: Narrative reviews on adherence to pharmacological treatment of depressive disorders suffer not only from the limited availability of good quality evidence, but also from an incomplete critical appraisal of available evidence on interventions both for depression and for other chronic disorders.

Antidepressive Agents↗
PubMedDate not supplied

Systematic reviews of interpretive research: interpretive data synthesis of processed data.

This paper discusses the synthesis of qualitative data during the systematic review of interpretive research. Current approaches to data synthesis can be broadly classified as either descriptive or interpretive. Descriptive data synthesis is achieved through narrative and tabulation. While a number of different terms have been used, interpretive synthesis is achieved through processes similar to those used by primary interpretive researchers. However, there has been only limited professional discussion and debate of this issue and existing methods are in need of further investigation and the validity and usefulness of the product of this synthesis examined.

Data Interpretation, Statistical↗

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