Agreement was not found in adolescents' quality of life rated by parents and adolescents.
OBJECTIVE
Limited evidence examines agreement between the ratings of adolescents' health-related quality of life (HRQOL) by parents and adolescents especially accounting for measurement properties. This study aimed to test whether agreement exists between the dyads using a methodology of measurement invariance.


METHODS
We conducted a telephone survey to collect data from parents and their adolescents enrolled in Florida's Children's Medical Services (376 pairs) using the PedsQL 4.0. We used multi-group confirmatory factor analysis to test measurement invariance, including configural (equivalent HRQOL construct), metric (equivalent item-domain associations), scalar (equivalent starting value of ratings), and residual (equivalent nonsystematic measurement errors of ratings) invariance. We also investigated correlates of discrepancies in the dyadic ratings.


RESULTS
There were equivalent HRQOL constructs and item-domain associations between the dyads. However, some items show different starting values and nonsystematic errors in the dyadic ratings. After adjusting for noninvariant items, adolescents reported significant higher HRQOL scores than parents in all domains (P<0.05). Parents' rating of adolescents' health significantly contributed to discrepancies in the dyadic ratings (P<0.05).


CONCLUSIONS
Adolescents rated HRQOL higher than their parents. This discrepancy was associated with severe health conditions. Without assuring measurement invariance, comparisons of the dyadic HRQOL ratings can be misleading.
Department of Epidemiology and Health Policy Research, College of Medicine, University of Florida, Gainesville, FL 32610-0147, USA. ichuang@ufl.edu
I-Chan
IC
Huang
Elizabeth A
EA
Shenkman
Walter
W
Leite
Caprice A
CA
Knapp
Lindsay A
LA
Thompson
Dennis A
DA
Revicki
D000293:Adolescent; D016497:Adolescent Health Services / Q000706:statistics & numerical data; D000704:Analysis of Variance; D003430:Cross-Sectional Studies; D005260:Female; D005431:Florida; D019538:Health Care Surveys; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D010290:Parents; D011788:Quality of Life / Q000523:psychology*; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires