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Biomedical subjects

S Stewart-Brown

Publications and source records attributed to S Stewart-Brown.

At least 19 recordsLinked to original sources
PubMed1999

Measuring the effectiveness of cataract surgery: the reliability and validity of a visual function outcomes instrument.

AIMS: To assess test-retest reliability and validity of the "TyPE" patient self assessed visual function questionnaire, as part of a study in two hospitals measuring the effectiveness of cataract surgery. The American TyPE questionnaire had minor adaptations made for use in Britain. METHODS: Test-retest reliability was assessed on 63 out of 378 adult cataract surgery patients in the study, using Spearman correlation coefficients and kappa coefficients of agreement. "Construct" validity was evaluated by comparing the association between changes in visual function questionnaire scores after surgery, with patients' perception of change in visual function obtained by independent interview of 24 patients. RESULTS: The TyPE questionnaire items showed very good test-retest reliability. Average Spearman and kappa coefficients for 39 patients from hospital 1 were 0.93 and 0.84 respectively. Spearman and kappa coefficients of 0.9 and 0.81 were obtained for those nine patients in hospital 2 where both the test and retest questionnaires were filled in by the same people. However, for the 15 patients from hospital 2, where the questionnaire was filled in by different people in the retest, reliability was less good: the Spearman coefficients were still high, average 0.72, but the kappa coefficients were poor, 0.27. Good construct validity was exhibited, with a correlation of 0.79 between change in distance vision score from the questionnaires and the independent interview. CONCLUSIONS: The adapted TyPE questionnaire is both very reliable and has good construct validity. The kappa coefficient should be used wherever possible to evaluate reliability. The test-retest reliability and validity and practicability of other visual function questionnaires have not been assessed adequately, and further development should be carried out of all such questionnaires, so that they may be introduced into routine clinical care.

Activities of Daily Living↗
PubMed1999

Assessment of the SF-36 version 2 in the United Kingdom.

OBJECTIVES: To introduce the UK SF36 Version II (SF36-II), and to (a) gain population norms for the UK SF36-II in a large community sample as well as to explore the instrument's internal consistency reliability and construct validity, and (b) to derive the Physical Component Summary (PCS) and Mental Component Summary (MCS) algorithms for the UK SF36-II. DESIGN: Postal survey using a questionnaire booklet, containing the SF-36-II and questions on demographics and long term illness. SETTING: The sample was drawn from General Practitioner Records held by the Health Authorities for Berkshire, Buckinghamshire, Northamptonshire, and Oxfordshire. SAMPLE: The questionnaire was sent to 13,800 randomly selected subjects between the ages of 18-64 inclusive. OUTCOME MEASURES: Scores for the eight dimensions of the UK SF36-II and the PCS and MCS summary scores. RESULTS: The survey achieved a response rate of 64.4% (n = 8889). Internal consistency of the different dimensions of the questionnaire were found to be high. Normative data for the SF-36 are reported, broken down by age and sex, and social class. Factor analysis of the eight domains produced a two factor solution and provided weights for the UK SF36-II. CONCLUSION: The SF36-II domains were shown to have improved reliability over the previous version of the UK SF36. Furthermore, enhancements to wording and response categories reduces the extent of floor and ceiling effects in the role performance dimensions. These advances are likely to lead to better precision as well as greater responsiveness in longitudinal studies.

Adolescent↗
PubMed1998

Screening in child health.

Screening programmes in child health have evolved on the basis of individual enthusiasm and professional consensus, rather than being based on objective evidence of benefit. Three reviews have been carried out in the UK over the past 10 years. The only programmes which show robust evidence of effectiveness are those for PKU and hypothyroidism. The value of screening for hearing loss and vision defects is widely accepted, but there are many unresolved issues. Programmes for detection of congenital dislocation of the hip, congenital heart disease and growth disturbances are of doubtful value. Early identification of developmental problems is stressed by parents, but screening may not be the best way to achieve this. The UK programme of well-child care places increasing emphasis on promotion of physical and emotional health; screening tests should either be subjected to quality monitoring, or removed from the programme if they cannot fulfil the classic criteria of Wilson and Jungner.

Child↗
PubMed1998

Systematic review of the school entry medical examination.

AIMS: To summarise and critically evaluate research conducted in the UK between 1962 and 1996, on the effectiveness and efficiency of the school entry medical (SEM) examination. METHODS: An electronic search of a large number of databases, in conjunction with a search of reference lists, and sources in the grey literature produced a total of 64 studies. RESULTS: Only one overview and 16 primary studies met the review's broad inclusion criteria. The results showed significant differences in the identification and referral of new and ongoing problems not only between the routine and selective SEM but also within the two types of SEM examination. There were also large differences in the numbers of children selected for SEM examination. No study included in the review defined either the methods or the criteria used to identify children as screen positive. No study provided follow up of children after referral to estimate the positive predictive value or yield of the screening, or follow up of the whole cohort to identify false negative cases. CONCLUSION: Data on the effectiveness and efficiency of both the routine and selective SEM examination in accurately identifying children with new or ongoing health problems are not available at the present time. The studies reviewed here demonstrate the fragility of the evidence on which the school entry medical is based, and call into question the ethical basis of this programme.

Child, Preschool↗
PubMed1997

Emotional health problems are the most important cause of disability in adults of working age: a study in the four counties of the old Oxford region.

OBJECTIVE: To assess the contribution of emotional health problems to the burden of disability affecting people of working age. DESIGN: Analysis of data collected in a postal questionnaire survey of a random sample of people aged 18-64 years. SETTING: The four counties of the old Oxford region in 1991. SUBJECTS: 9332 people who responded to a questionnaire survey mailed to 14,000 people randomly selected from the Family Health Service Authority registers of the four counties of Berkshire, Buckinghamshire, Oxfordshire, and Northamptonshire. OUTCOMES MEASURES: Interference with work or other regular daily activity as reported in questions 4 and 5 of the health status measure SF-36. RESULTS: In this population the prevalence of disability attributable to emotional health problems was greater than that attributable to all physical health problems combined. People reporting that their work or other regular daily activity was affected by their emotional health were much less likely to report a long-standing illness, consultation with a GP or consultation with a hospital doctor than people reporting a physical health problem. CONCLUSIONS: Emotional health problems are a more important cause of disability in adults of working age than all physical health problems put together. Their importance is underestimated in health needs assessment exercises, which are based on NHS consultation rates or reporting of chronic illness. Research into the causes, prevention, and management of emotional health problems should be a national priority for the health service.

Activities of Daily Living↗
PubMed1995

The effects of fundholding in general practice on prescribing habits three years after introduction of the scheme.

OBJECTIVES: To observe changes in prescribing practice that occurred after the introduction of fundholding in first wave practices and to contrast these with changes occurring in similar non-fundholding practices. DESIGN: Prospective observational study. SETTING: Oxford region fundholding study. SUBJECTS: Eight first wave fundholding practices and five practices that were not interested in fundholding in 1990-1, which were similar in terms of practice size, training status, locality, and urban rural mix. Three of the fundholding and none of the non-fundholding practices were dispensing practices. MAIN OUTCOME MEASURES: Changes in prescribing practice as measured by net cost per prescribing unit, cost per item, number of items prescribed, and substitution rates for generic drugs three years after the introduction of fundholding. Data for fundholding practices were analysed separately according to whether they were dispensing or non-dispensing practices. RESULTS: Prescribing costs rose by a third or more in all types of practice. The patterns of change observed in this cohort after one year of fundholding were reversed. No evidence existed that fundholding had controlled prescribing costs among non-dispensing fundholders; costs among dispensing fundholders rose least, but the differences were small compared with the overall increase in costs. CONCLUSIONS: Early reports of the effectiveness of fundholding in curbing prescribing costs have not been confirmed in this longer term study.

Drug Costs↗
PubMed1994

Damp housing and adult health: results from a lifestyle study in Worcester, England.

STUDY OBJECTIVE: To explore the relationship between damp housing and adult health using two separate measures of ill health and taking into account the confounding effects of health related lifestyles and social factors. DESIGN AND SETTING: Analysis of responses gathered in a cross sectional, postal questionnaire survey of a randomly selected sample of 5347 residents of Worcester. PARTICIPANTS: Altogether 2353 people aged 16 to 64 years responded to the survey (adjusted response 52%). RESULTS: Nine per cent of respondents lived in housing which they reported to be damp. Rates were highest among young women. People who lived in damp housing were more likely to report long standing illness, disability, or infirmity; the increased prevalence could not be attributed to any particular medical condition. Perceived ill health, as measured by the sleep, energy, and social isolation dimensions of the Nottingham Health Profile, was also more common in this group. These associations could not be explained by lifestyle factors; the relationship proved strongest among people in non-manual social classes living in owner occupied housing. The prevalence of ill health increased as the severity of dampness increased. CONCLUSION: Self reported damp housing and ill health in adults were strongly associated, most noticeably among people in non-manual social classes living in owner occupied housing. The association met many of the epidemiological criteria necessary for suggesting causality: alternative explanations are discussed.

Adolescent↗
PubMed1987

Screening for hearing loss in childhood: a study of national practice.

A questionnaire survey of all health districts in England and Wales was carried out at the end of 1984 to document screening programmes for identifying hearing loss in childhood. The response rate was 81.3%. All districts performed distraction testing, all but nine aiming at doing so at 7-9 months of age. All districts tested children's hearing at school, generally before 7 years of age. The number of times that children were screened both before school and at school varied considerably, from one to six times before school and one to six times at school. Few districts collected information that would allow them to make judgments about the efficiency of effectiveness of their screening programmes.

Age Factors↗
PubMed1986

Child behavior and accidental injury in 11,966 preschool children.

Social and behavioral characteristics of 11,966 British children, aged 5 years, and mothers' reports of accidental injuries between birth and age 5 years were analyzed. Aggressive behavior was associated with all accidental injuries after controlling psychosocial variables including social class; crowding; mother's psychological distress, age, and marital status; and child's sex. Overactivity was associated only with injuries not resulting in hospitalization after control of the covariates. The relative risk of injuries resulting in hospitalization was 1.9 among children with both high activity and high aggression scores compared with children with low scores on both behavioral scales. The findings support the inference that aggression and overactivity are independently associated with accidents. The associations between child behavior and injuries were stronger than the associations between injuries and the social factors including social class and crowding. This finding suggests that interventions aimed at high-risk groups may be effective supplements to environmental interventions.

Accident Proneness↗
PubMed1986

Case definition in childhood accident studies: a vital factor in determining results.

Research into possible aetiological factors associated with childhood accidents has failed to produce a consistent picture. In this paper we investigate the extent to which these discrepancies are attributable to different methods of case ascertainment. The approach was to use three different criteria for identifying accidents and to apply a number of commonly used statistical techniques to eight social and environmental factors. The data base consists of a nationally representative sample of 13 135 children (the Child Health and Education Study). In this way, broadly similar profiles were obtained for children reported to have had at least one accident in the first five years and for those who were said to be accident repeaters--the major risk factors in common for these two outcomes were young maternal age and residence in 'average' or 'well-to-do' urban areas. On the other hand, there were major differences in the results when admission to hospital for an accident was taken as the outcome--although young maternal age was still strongly associated, large family size and the loss or replacement of a natural parent were now also dominant risk factors. There was no relationship with area of residence. The conclusion from these example analyses is therefore that variation in case selection can lead to different conclusions about the risk factors associated with childhood accidents.

Accidents↗