Mobility and Quality of Life: A Cross-Sectional Psychometric Evaluation of the Validity and Reliability of a Dutch Translation of the MobQoL-7D Outcome Measure

Background: The Mobility and Quality of Life-7 Dimension (MobQoL-7D) is a new patient-reported outcome measure for mobility-related quality of life. Our aim was to translate and test a Dutch-language version. Methods: A cross-sectional psychometric evaluation study was undertaken. The sampling frame was community-dwelling adults living in the Netherlands who had a long-term (>6 months) mobility impairment. Participants were recruited through a Dutch research agency, and data were collected via online survey. Statistical and psychometric analyses were undertaken to assess the interpretability, validity and reliability of the MobQoL-7D Dutch, including assessment of missing data, floor/ceiling effects, test–retest reliability, structural validity, known-group validity and convergent validity. Results: n = 308 respondents completed the survey; sub-group sample sizes ranged from n = 29 to n = 87. No issues with missing data were found. Despite ceiling effects per item (ranging from 23.1% to 56.5%), there were no floor/ceiling effects for overall index values (12.3% and 0%, respectively). The findings show excellent test–retest reliability of the index value over a two-week period (n = 37; ICC = 0.95), and potential discriminative ability to detect differences between known groups. Factor analyses confirmed unidimensionality. Conclusions: The results provide promising evidence of the validity and reliability of the MobQoL-7D Dutch; further research is needed to confirm these findings.