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PubMed1995

Validation and application of a subjective knee questionnaire.

Patients' complaints on limitations in activities of daily living (ADL) and sports are possible signs for various injuries of the knee joint. These complaints can be easily assessed by the patient using a questionnaire with visual analogue scale (VAS) responses. A German translation of the English questionnaire concerning knee complaints [4] has been validated and tested for clinical use. It consists of 28 questions. For the statistical analysis, an overall score (VAS score) of the questionnaire was determined. The validation included an expert evaluation on the content of the questionnaire, a test for the reliability, a comparison with subjective knee scoring systems (Cincinnati score, Lysholm score) and a test on VAS score results in patient groups with various knee injuries (discrimination of patients). For the evaluation of operative treatment results, the responsiveness of the questionnaire was tested in patients undergoing arthroscopic meniscus surgery and anterior cruciate ligament reconstruction. The investigation was conducted prior to the operation, 2, 6, 12 and 24 weeks after surgery for both groups and also 36 weeks after surgery for the cruciate ligament patients. Interviews conducted with knee surgeons (so-called knee experts) revealed that 85% judged the questionnaire as being acceptable for clinical use. The reliability of the VAS score for healthy individuals was r = 0.86. The reliability for patients in a postoperative rehabilitation programme was r = 0.92. By means of the VAS score we were able to assess the extent of limitations in knee function in various patient groups with meniscus lesions, insufficiency ot the anterior and posterior cruciate ligaments and chondromalacia.(ABSTRACT TRUNCATED AT 250 WORDS)

Activities of Daily Living↗
PubMed1997

Quality of life as outcome in the treatment of osteoporosis: the development of a questionnaire for quality of life by the European Foundation for Osteoporosis.

The morbidity of osteoporosis is caused by fractures. Vertebral fractures lead to pain and disability and a decrease in quality of life. A Working Party of the European Foundation for Osteoporosis has developed a specific questionnaire for patients with established vertebral osteoporosis. This questionnaire is intended for use in clinical trials. The questionnaire consists of questions and visual analogue scales in the following domains: pain, activities of daily living, jobs around the house, mobility, leisure and social activities, general health perception and mood. The questionnaire has been translated from English into French, German, Italian, Hebrew, Swedish and Dutch. The questionnaire is currently being validated in a multicentre study involving patients with stable osteoporosis and control subjects. Preliminary results indicate that the reproducibility is sufficient and that the questionnaire is able to discriminate between patients with vertebral osteoporosis and control subjects.

Activities of Daily Living↗
PubMed2004

Use of a questionnaire to screen for frailty in the elderly: an exploratory study.

BACKGROUND AND AIMS: In a pilot study of community-dwelling geriatric clinic patients (N=48, aged 63-90) we examined the use of a questionnaire to classify frailty status by comparing it with standardized markers of frailty. The questionnaire, developed by Strawbridge et al. in 1998, defines frailty as difficulty in more than one of four domains of functioning: physical, cognitive, sensory, and nutritive. METHODS: Subjects were classified as frail or not frail by questionnaire and assignment was compared with testing of physical and cognitive measures in cross-sectional analysis. Demographic variables, functional inventories, physical activity levels, clinician impression of frailty, and 3-year health outcomes were also examined. RESULTS: Thirty-three percent of subjects were classified as frail. Frailty classification by the Strawbridge questionnaire was correlated to Timed Up and Go and repetitive Sit-to-Stand tests, bimanual dexterity and cognitive tests. A discrepancy was found between assignment of cognitive difficulty, by questionnaire and cognitive performance. When overall Strawbridge frailty scores were modified to account for those with poor cognitive performance who did not report cognitive difficulty, the prevalence of frailty increased to 42%. At 3-year follow-up, the modified Strawbridge frailty classification (p<0.05) and clinician impression of frailty (p<0.01) were both significant predictors of death and institutionalization combined. CONCLUSIONS: This study serves as an initial inquiry into the potential validity and utility of the Strawbridge frailty questionnaire as a simple screening tool to identify patients who may warrant detailed functional testing.

Aged↗
PubMed2006

How to screen for depression and emotional problems in patients with diabetes: comparison of screening characteristics of depression questionnaires, measurement of diabetes-specific emotional problems and standard clinical assessment.

AIMS/HYPOTHESIS: We compared the screening performance of different measures of depression: the standard clinical assessment (SCA); the Beck Depression Inventory (BDI); the Center of Epidemiological Studies-Depression Scale (CES-D); and the Problem Areas in Diabetes (PAID) questionnaire, which assesses diabetes-specific distress. We also studied the ability of these measures to detect diabetes-related distress. MATERIALS AND METHODS: A total of 376 diabetic patients (37.2% type 1; 23.9% type 2 without insulin treatment, 38.8% type 2 with insulin) completed the BDI and CES-D; patients who screened positive participated in a diagnostic interview, the Composite International Diagnostic Interview (CIDI). Also, all patients completed the PAID questionnaire. Results of the SCA that related to depression diagnosis were reviewed to correct for false negative screening results. RESULTS: The prevalence of clinical depression was 14.1%, with an additional 18.9% of patients receiving a diagnosis of subclinical depression. Sensitivity for clinical depression in SCA (56%) was moderate, whereas BDI, CES-D and the PAID questionnaire showed satisfactory sensitivity (87, 79 and 81%, respectively). For subclinical depression, the sensitivity of the PAID questionnaire (79%) was sufficient, whereas that of SCA (25%) was poor. All methods showed low sensitivity for the detection of diabetes-specific emotional problems (SCA 19%, CIDI 34%, BDI 60%, CES-D 49%). CONCLUSIONS/INTERPRETATION: The screening performance of SCA for clinical and subclinical depression was modest. Additional screening for depression using the PAID or another depression questionnaire seems reasonable. The ability of depression screening measures to identify diabetes-related distress is modest, suggesting that the PAID questionnaire could be useful when screening diabetic patients for both depression and emotional problems.

Depression↗
PubMed2004

Comparison of EORTC quality of life core questionnaire (EORTC-QLQ-C30) and gastrointestinal quality of life index (GIQLI) in patients undergoing elective colorectal cancer resection.

BACKGROUND: EORTC-QLQ-C30 questionnaires and GIQLI questionnaires are used to evaluate post-operative quality of life (QoL). It was not clear whether results of both instruments are comparable. Therefore, the level of agreement between both QoL questionnaires was evaluated in patients undergoing elective colorectal cancer resection. METHODS: Pre-operatively, 7 and 30 days after surgery 116 patients answered the EORTC-QLQ-C-30 and the GIQLI questionnaires in random order. Individual questions with similar content from each questionnaire were compared. Data for global QoL, physical (PF), emotional (EF) and social function (SF) were linearly transformed to fit a scale from 0 to 100. Data from the two instruments were correlated and the level of agreement between them was calculated according to the method of Bland and Altman. RESULTS: A total of 308 data sets [(pre-op. n=116; 7th pod n=101; 30th post-operative day (pod) n=91)] were evaluated. Both instruments detected a reversible reduction of QoL after surgery and gave inferior results for patients with conditions known to impair QoL. EORTC-QLQ-C30 was more sensitive than GIQLI. The correlation between the two questionnaires for global QoL, PF and EF was good ( r=0.53-0.66, p<0.01), but no correlation for SF was detected ( r=-0.44, p=0.44). Linearly transformed scores from the two instruments differed considerably from -13 (95%CI -51 to 24) points (QoL) to 10 (-38 to 58) points (PF). CONCLUSION: Although EORTC-QLQ-C30 scores and GIQLI scores from patients undergoing elective colorectal cancer surgery did correlate well, the level of agreement between the two instruments was quite low. Perioperative QoL data from the two instruments cannot be compared with each other.

Aged↗
PubMed2004

Psychometric documentation of a quality-of-life questionnaire for patients undergoing antireflux surgery (QOLARS).

BACKGROUND: The purpose of our study was to develop a quality-of-life (QoL) questionnaire for patients with gastroesophageal reflux disease (GERD) who have undergone laparoscopic fundoplication. This questionnaire was developed to be more comprehensive than existing measures. METHODS: Between 1994 and 2002, 252 patients underwent laparoscopic fundoplication for GERD in the 1st Department of Surgery, Semmelweis University. We undertook a retrospective analysis: each of 252 operated patients was given a questionnaire and was requested to complete it and return it in an enclosed envelope. A total of 116 patients returned completed questionnaires. The patients included 55 men and 61 women, with a mean age of 46 years (range 14-77). These patients were used in the psychometric evaluation. The questionnaire consisted of 50 questions (including the Visick score, EORTC-QLQ-C30, and a modified GERD-HRQL). RESULTS: Internal consistency reliability was high (alpha value overall, 0.95, range, 0.74-0.96). Using convergent and divergent validity, construct validity was evaluated by examining Pearson correlation coefficients between items and scales. Construct validity was demonstrated based on observed correlations. Known groups validity was upheld because patients who experienced more symptoms and patients who has higher Visick scores reported worse QoL than those with less symptoms or lower Visick scores. CONCLUSIONS: Our questionnaire is a short and user-friendly instrument with excellent psychometric properties. It has been found to be valid and reliable.

Adolescent↗
PubMed2004

Validation of the Tunisian version of the Roland-Morris questionnaire.

Our aim was to validate a culturally adapted, Tunisian-language version of the Roland-Morris Disability Questionnaire (RMDQ), which is a reliable evaluation instrument for low-back-pain disability. A total of 62 patients with low back pain were assessed by the questionnaire. Reliability for the 1-week test/re-test was assessed by a construction of a Bland Altman plot. Internal construct validity was assessed by Cronbach's alphatest. External construct validity was assessed by association with pain, the Schober test and the General Function Score. Sensitivity to change was determined using a t-test for paired data to compare RMDQ scores at inclusion and at completion of the therapeutic sequence of local corticosteroid injections. We also compared the questionnaire score with the General Function Score, both taken after completion of the therapeutic sequence. The constructed Bland Altman plot showed good reliability. Internal consistency of the RMDQ was found to be very good and the Cronbach's alpha test was 0.94, indicating a good internal construct validity. The questionnaire is correlated with the pain visual analogue scale (r=33; p=0.0001), with the Schober test (r=0.27; p=0.0001) and the General Function Score (r=56; p=0.0001) indicating an adequate external construct validity. The RMDQ administered after the therapeutic sequence is sensitive to change (r=0.83; p=0.000). Comparison of the questionnaire score to the General Function Score, after completion of the therapeutic sequence, was satisfactory (r=0.75; p=0.000). We conclude that the Tunisian version of the Roland-Morris questionnaire has good reliability and internal consistency. Furthermore, it has a good internal- and external construct validity and high sensitivity to change. It is an adequate and useful tool for assessing low-back-pain disability.

Disability Evaluation↗
PubMed2006

Evaluation of a short retrospective questionnaire for physical activity in women.

Physical activity (PA) is discussed as a preventive factor for many chronic diseases. Thus, in epidemiological studies it often is an important covariate. Due to frequently long latency periods, long-term PA in the past is of greater interest than current PA. However, there is a lack of retrospective questionnaires that are validated for long-term PA, including occupational, household, and leisure activities. We therefore evaluated a short questionnaire for the comprehensive assessment of usual PA in distant age periods, administered with cognitive interviewing techniques. From an ongoing study on postmenopausal breast cancer 110 cases and 101 controls, age 50-74 years, were randomly selected. Our questionnaire was administered in a telephone interview more than two months after the main study interview, which included a detailed questionnaire on PA performed in the age periods 30-49 years and 50+ years. Total PA scores were derived from both interviews as MET-hours per week. Degree of agreement was assessed using Bland-Altman analyses. Further, potential sources of systematic and random error were investigated. The mean difference between both questionnaires was 3 MET hours/week, and 53.6% of absolute differences were below 35 MET hours/week, i.e. showing good agreement. Further 28.9% of differences could be considered acceptable agreement. Measurement errors seem to be non-differential with respect to cancer status. The median interviewing time was 10 min. Overall, this short questionnaire appears to be a useful and valid tool to distinguish between high and low levels of women's physical activity in the distant past.

Adult↗
PubMed2006

A patient-based questionnaire to assess outcomes of foot surgery: validation in the context of surgery for hallux valgus.

BACKGROUND: A patient-based outcome measure with good measurement properties is urgently needed for use in clinical trials of foot surgery. METHODS: We evaluated an existing foot pain and disability questionnaire (the Manchester Foot Pain and Disability Questionnaire) for its suitability as an outcome measure in the context of hallux valgus corrective surgery. Interviews with patients led to initial changes, resulting in 20 candidate questionnaire items with five response categories each. These were tested in a prospective study of 100 patients (representing 138 foot operations) undergoing hallux valgus corrective surgery. Analysis of underlying factor structure, dimensionality, internal reliability, construct validity and responsiveness of the questionnaire items in relation to (i) SF-36 general health survey and (ii) American Orthopaedic Foot & Ankle Society (AOFAS) hallux clinical scale resulted in a final 16 item questionnaire (the 'Manchester-Oxford Foot Questionnaire' (MOXFQ)), consisting of three domains/scales: 'Walking/standing' (seven items), 'Pain' (five items) and 'Social interaction' (four items) each having good measurement properties. All three domains were unidimensional. CONCLUSIONS: The new 16-item MOXFQ has good measurement properties in the context of outcomes assessment of surgery for hallux valgus. Future studies should assess the MOXFQ in the context of surgery for other foot and ankle conditions.

Adult↗
PubMed1993

Reproducibility and validity of food intake measurements from a semiquantitative food frequency questionnaire.

Few food frequency questionnaires have been evaluated for their ability to assess intakes of individual foods that may be related to disease independently of their nutrient content. The reproducibility and validity of food intake measurements by a 131-item semiquantitative food frequency questionnaire were evaluated in a sample of 127 men from the Health Professionals Follow-up Study, a large longitudinal study of diet and disease. Each subject completed two questionnaires 1 year apart and two 1-week diet records 6 months apart during the intervening year. Pearson correlations assessing reproducibility between food intakes from the two questionnaires ranged from .31 for pie to .92 for coffee (mean = .59). Validity was measured by comparing food intakes from the second questionnaire with those from the diet records. Pearson correlations corrected for within-person weekly variation in diet record data ranged from .17 for other nuts to .95 for bananas (mean = .63). Large within-person variation precluded the calculation of accurate validity correlations for 29 foods. As we previously observed in women, the foods most often overreported were fruits and vegetables, and meats and dairy products were most often underreported. With few exceptions, reasonable levels of reproducibility and validity were observed for intake of individual foods in this extensive food frequency questionnaire.

Adult↗
PubMed1985

The three-factor eating questionnaire to measure dietary restraint, disinhibition and hunger.

This report describes the construction of a questionnaire to measure three dimensions of human eating behavior. The first step was a collation of items from two existing questionnaires that measure the related concepts of 'restrained eating' and 'latent obesity', to which were added items newly written to elucidate these concepts. This version was administered to several populations selected to include persons who exhibited the spectrum from extreme dietary restraint to extreme lack of restraint. The resulting responses were factor analyzed and the resulting factor structure was used to revise the questionnaire. This process was then repeated: administration of the revised questionnaire to groups representing extremes of dietary restraint, factor analysis of the results and questionnaire revision. Three stable factors emerged: (1) 'cognitive restraint of eating', (2) 'disinhibition' and (3) 'hunger'. The new 51-item questionnaire measuring these factors is presented.

Adolescent↗
PubMed1996

Use of the Centers for Disease Control and Prevention childhood lead poisoning risk questionnaire to predict blood lead elevations in pregnant women.

OBJECTIVE: To assess the accuracy of a questionnaire developed by the Centers for Disease Control and Prevention (CDC), given to pregnant women for identification of children at risk for lead poisoning. METHODS: The study population consisted of all 314 new prenatal patients enrolled in health department clinics in 1990-1992. Lead was measured in venous blood, and patients completed written questionnaires to gather information about lead exposure risk factors. The relationship between elevated maternal blood lead levels (at or greater than 10 micrograms/dL or 0.483 mumol/L) and responses to the CDC questionnaire and other questions were examined using chi 2 statistical analysis. RESULTS: Two hundred ninety-nine women provided responses to questions about lead exposure risk. Thirty-nine women (13%) had elevated blood lead levels. A woman with a positive response to at least one CDC question was more likely to have elevated blood lead than a woman who answered negatively to all four CDC questions (relative risk = 2.39, 95% confidence interval 1.17-4.89; P = .01). Using the CDC definition of high risk ("yes" to at least one question), the questionnaire had a sensitivity of 75.7% and a negative predictive value of 93.1%. A questionnaire that combined housing conditions, smoking status, and high consumption of canned foods had a sensitivity of 89.2% and a negative predictive value of 96.4%. A high prevalence of elevated blood lead in children living with women with elevated blood lead was observed. CONCLUSION: Querying pregnant women about risk factors for lead exposure can aid in assessing prenatal lead exposure risk. The sensitivity and negative predictive value of the CDC questionnaire, when used with high-risk women, are comparable to its reported accuracy in young children.

Centers for Disease Control and Prevention, U.S.↗
PubMed1990

Validation of a self-administered diet history questionnaire using multiple diet records.

The validity of a self-administered diet history questionnaire has been estimated using as the reference data the mean of three 4-day diet records collected over the year prior to the administration of the questionnaire, in 1985-1986. Subjects were women ages 45-70 years, participants in the Women's Health Trial Feasibility Study, a multi-center clinical trial in which some women were randomized to be taught to adopt and maintain a low-fat diet, while others maintained their usual diet. The questionnaire produced group mean nutrient estimates closely approximating the values obtained by three 4-day records, e.g. in the usual-diet group, 37.7% of calories from fat by both food records and by questionnaire, and in the low-fat group, 21.3% of calories from fat by food records and 23.7% of calories from fat by questionnaire. Correlations between questionnaire and diet records for per cent of calories from fat were 0.67 and 0.65 respectively in the two groups; most correlations were in the 0.5-0.6 range, and were similar to those achievable by a single 4-day food record.

Aged↗
PubMed1993

Performance of semiquantitative food frequency questionnaires in international comparisons. Mexico City versus San Antonio, Texas.

International dietary comparisons present a number of methodologic difficulties. We developed two semiquantitative food frequency questionnaires for use in Mexico City and San Antonio, Texas. The Mexico City questionnaire contained 85 food items and the San Antonio questionnaire contained 108. Thirty-six items were common to both questionnaires. The questionnaires were administered to 128 Mexican Americans, 35 to 64 years old, residing in a low-income barrio neighborhood of San Antonio and to 644 similarly aged Mexicans residing in a low-income "colonia" of Mexico City. Major differences in fat and carbohydrate intake as a percent of total kilocalories were observed between the two study groups, with Mexico City residents consuming approximately 18 to 21% of calories from fat and 68 to 72% from carbohydrate compared to 29 to 33% from fat and 48 to 52% from carbohydrate for Mexican Americans from San Antonio. Both of these differences were highly statistically significant (P < 0.001). A number of arguments support the validity of these findings. First, the distribution of high- and low-fat foods was similar on both questionnaires. Also, of the top-ten foods (as contributors to total kilocalorie intake) in San Antonio, seven were high in fat (> 30% of kilocalories), whereas this was true of only three of the top-ten foods in Mexico City.

Adult↗
PubMed2004

The association of Rose questionnaire angina pectoris and coronary calcification in a general population: the Rotterdam Coronary Calcification Study.

PURPOSE: The Rose questionnaire is a standardized method of measuring angina pectoris in general populations. Electron-beam computed tomography (CT) is a non-invasive technique to quantify the amount of coronary calcification. In a population-based study, we investigated the association between Rose questionnaire angina pectoris and coronary calcification. METHODS: The Rotterdam Coronary Calcification Study is embedded in the Rotterdam Study, a population-based study in subjects aged > or = 55 years. Participants of the Rotterdam Coronary Calcification Study underwent an electron-beam CT scan between 1997 and 2000. Coronary calcification was quantified in a calcium score according to Agatston's method. Rose questionnaire angina pectoris was assessed during a home interview. The first 2013 participants were included in the present analyses. RESULTS: In men, the presence of Rose questionnaire angina pectoris was associated with a 12.9-fold (95% confidence interval: 3.8-43.7) increased risk of a calcium score >1000 (reference: calcium score 0-100). The corresponding relative risk in women was 4.8 (2.0-11.3). Similar results were found when we computed sex-specific quartiles of the calcium score. CONCLUSIONS: Rose questionnaire angina pectoris is strongly associated with the amount of coronary calcification. Rose questionnaire angina pectoris corresponds better with the amount of coronary calcification in men than in women.

Aged↗
PubMed2006

The modified Trait and State Food-Cravings Questionnaires: development and validation of a general index of food craving.

In the present study, the multidimensional Trait and State Food Cravings Questionnaires (FCQ-T and FCQ-S), as developed by Cepeda-Benito, Gleaves, Williams, and Erath, [2000. The development and validation of the State and Trait Food Cravings Questionnaires. Behavior Therapy, 31, 151-173], were modified in order to construct an index of general food craving instead of specific food craving. The factor structure, validity and reliability of the modified questionnaires, renamed as the Trait and State General Food Cravings Questionnaires (G-FCQ-T and G-FCQ-S), were investigated in three separate studies. Firstly, exploratory factor analyses were conducted, which yielded a G-FCQ-T with a four-factor structure, that was considerably shorter as compared to the original (nine-factor) FCQ-T, and a G-FCQ-S of which the factor structure was highly comparable to the original FCQ-S. Secondly, in an attempt to replicate the factor structures of the G-FCQ-T and the G-FCQ-S as found in Study 1, confirmative factor analyses were performed. Results indicated adequate fits for both questionnaires. In addition, the test-retest reliability of both versions was satisfactory and an analysis of the construct validity generally revealed the expected results. In Study 3, the validity of the state version of the G-FCQ was further investigated by relating scores on this questionnaire to indices of food deprivation and satiation. Results indicated that the G-FCQ-S indeed measures food craving as a variable state, which is influenced by situational and temporal variables. Altogether, it can be concluded that the G-FCQ-T and G-FCQ-S are both reliable and valid measures of general trait-like and state-dependent food craving.

Adolescent↗
PubMed2004

Development and validation of a patient questionnaire to determine New York Heart Association classification.

BACKGROUND: New York Heart Association (NYHA) classification correlates with quality of life and is useful in tracking changes in status in clinical trials. We explored methods to determine NYHA class in multicenter trials where double-blind conditions could not be maintained. METHODS AND RESULTS: A questionnaire was developed containing 7 major questions based on the standard definitions of NYHA classes. The questionnaire was administered to 116 patients with varying degrees of heart failure. When comparing NYHA determined by physicians at the site to NYHA assigned by 3 independent physician graders, there was an approximate 60% concordance. Concordance between independent reviewers was approximately 75%. Results of repeat grading of 30 randomly selected questionnaires indicated that graders provided the same score 90% of the time. Thus, although there were some differences from the site determination of NYHA class, the questionnaire had good inter- and intragrader reproducibility. In a second group of 103 patients enrolled in an ongoing device-intervention trial, we demonstrated that it is feasible to employ the questionnaire in a multicenter trial. Finally, NYHA class was correlated with quality of life and peak exercise oxygen consumption. CONCLUSIONS: A standardized questionnaire provided an approximate 60% concordance in assigning NYHA classification compared to the site assessment with approximately 90% reproducibility. This approach may be useful to determine NYHA classification within the context of clinical trials where blinded conditions are not possible.

Clinical Trials as Topic↗
PubMed2005

Activity questionnaires; a useful tool in accessing heart failure patients.

AIM: The aim of the study was to correlate the score derived from Specific Activity Questionnaire (SAQ), Left Ventricular Dysfunction 36 (LVD 36) and the Minnesota Living with Heart Failure Questionnaire (LIhFE) with peak oxygen consumption measured during maximal treadmill exercise spirometry in patients with heart failure. METHODS: We prospectively studied 106 patients, average age 47+/-15.5 (mean+/-SD), with symptomatic heart failure. All were asked to answer the questions of the above mentioned questionnaires. Subsequently patients underwent treadmill exercise spirometry to measure peak oxygen consumption (VO2 peak ml/kg/min) using the Dargie protocol and to derive functional class according to the Weber classification system. RESULTS: SAQ had a very high performance in classifying patients with a VO2 peak <20 ml/kg/min and those with a VO2 peak <14 ml/kg/min. The correlation between VO2 peak achieved and the METs corresponding to the score derived from SAQ according to the given answers was r=0.77 (p<0.01). The correlation between VO2 peak achieved and the score from LVD 36 was r=-0.74 (p<0.01). The correlation between VO2 peak achieved and the score from LIhFE was r=-0.71 (p<0.01). CONCLUSION: The Specific Activity Questionnaire, the Left Ventricular Dysfunction and the Minnesota Living with Heart Failure Questionnaire were used to predict aerobic capacity and all correlated significantly with peak VO2 achieved from exercise spirometry. The above questionnaires represent a useful method to access heart failure patients and are valuable for those unable to undergo a treadmill test.

Adolescent↗