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Abstract
Objective: The aim of this study was to devise an evidence-based missing data rule for the Quality of Life Inventory-Disability (QI-Disability) questionnaire specifying how many missing items are permissible for domain and total scores to be calculated using simple imputation. We sought a straightforward rule that can be used in both research and clinical monitoring settings. Method: A simulation study was conducted involving random selection of missing items from a complete data set of questionnaire responses. This comprised 520 children with intellectual disability from 5 diagnostic groups. We applied a simple imputation scheme, and the simulated distribution of errors induced by imputation was compared with the previously estimated standard error of measurement (SEM) for each domain. Results: Using a stringent criterion, which requires that the 95th percentile of absolute error be less than the SEM, 1 missing item should be permitted for 2 of the 6 QI-Disability subdomain scores to be calculated and 1 missing item per domain for the total score to be calculated. Other, less stringent criteria would allow up to 2 missing items per domain. Conclusion: Empirical evidence about the impact of imputing missing questionnaire responses can be gathered using simulation methods applied to a complete data set. We recommend that such evidence be used in devising a rule that specifies how many items can be imputed for a valid score to be calculated.
Original language | English |
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Pages (from-to) | E414-E418 |
Number of pages | 5 |
Journal | Journal of Developmental and Behavioral Pediatrics |
Volume | 43 |
Issue number | 6 |
DOIs | |
Publication status | Published - 1 Aug 2022 |
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Dive into the research topics of 'Devising a Missing Data Rule for a Quality of Life Questionnaire: A Simulation Study'. Together they form a unique fingerprint.Projects
- 1 Finished
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Characterising quality of life and its determinants for children with intellectual disability and their families
Downs, J., Leonard, H., Williams, K., Davis, E., Reddihough, D., Whitehouse, A. & Jacoby, P.
National Health & Medical Research Council NHMRC
1/01/16 → 31/12/19
Project: Research