Related Experiment Video
Updated: Jun 8, 2026

Qualitative and Quantitative Validation of Tools with Rating Scales Aimed at Assessing the Quality of University Service-Learning
Published on: August 29, 2025
The IWQOL-Kids(©): establishing minimal clinically important difference scores and test-retest reliability
1Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH, USA. avani.modi@cchmc.org
Abstract:
This study presents additional psychometric testing of the Impact of Weight on Quality of Life-Kids (IWQOL-Kids) with aims to establish distribution-based minimal clinically important difference scores (MCIDs) and evaluate test-retest reliability. Participants (N=263) represent a pooled sample of treatment-seeking obese adolescents (aged 11-19 years) from four large studies examining health-related quality of life (HRQOL) and psychosocial outcomes (Mz(BMI)=2.6 ± 0.4; M(age)=15.1 ± 1.9; 64% female; 51% Black, 46% White). Adolescents completed the IWQOL-Kids©. Standard errors of measurement, which represent the MCID for each scale, were: Physical Comfort=8.8; Body Esteem=7.7; Social Life=8.1; Family Relations=6.2; Total QOL =4.8. Test-retest reliabilities ranged from 0.75-0.88. These data provide further support for the excellent psychometric properties of the IWQOL-Kids. In addition, preliminary MCIDs for IWQOL-Kids scales have now been established, which can be used in clinical trials.
Related Concept Videos
Cochran's Q Test
Detection of Gross Error: The Q Test
Measures of Intelligence
Validity refers to how well a test measures what it claims to measure. An intelligence test should accurately assess intelligence rather than another characteristic, like anxiety. Criterion validity is one way to evaluate this; it...
Reliability and Validity
Kendall's Coefficient of Concordance
Wechsler's Contribution to Measures of Intelligence

