Brief report: The KIDSCREEN follow-up study on Health-related Quality of Life (HRQoL) in Spanish children and adolescents. Pilot test and representativeness.

The Spanish KIDSCREEN follow-up study reassessed the Spanish baseline sample (n=840) of the European KIDSCREEN study 3 years later (2006). The aims of this paper were to describe the KIDSCREEN follow-up study and the pilot test, and to analyze participation rates and representativeness. Instruments included the KIDSCREEN-52 HRQoL measure and a set of scales including the possible explanatory variables. Focus groups and individual interviews were carried out in a pilot test. Participants were compared with non-participants at baseline, and also with Eurostat census data. Twenty-two out of 24 subjects were interviewed in the pilot test. Fifteen items needed to be modified after the pilot test. Participation rate reached 54% (n=454). Participants (mean age=12.71 years old) were on average 6 months younger than non-participants (p=0.03), and from more educated families. KIDSCREEN follow-up instrumentation seems adequate for collecting factors with potential influence on HRQoL. Follow-up respondents' representativeness seems to be acceptable.

Changes in health-related quality of life (HRQoL) in a population-based sample of children and adolescents after 3 years of follow-up.

OBJECTIVES: To assess changes in health-related quality of life (HRQoL) in children and adolescents over a 3-year period and to examine factors associated with change. METHODS: A representative sample of Spanish children and adolescents aged 8-18 years and their parents completed the KIDSCREEN-52 questionnaire at baseline and again after 3 years. Data were also collected on gender, pubertal development (PD), and family socio-economic status (SES). Change in HRQOL over time was evaluated using effect sizes (ES). Generalized estimating equations (GEE) were used to analyze associations among changes in KIDSCREEN scores, socio-demographic factors, and pubertal development. RESULTS: Response rate at follow-up was 54% (n = 454). Overall, HRQoL worsened in eight out of the ten KIDSCREEN dimensions, with ES ranging from -0.10 (Moods and Emotions) to -0.34 (Psychological Well-being). The decrease was most marked in the intermediate age group (13-17 years of age at follow-up) and in girls. In the GEE models, pubertal development more strongly impacted changes in girls than in boys. CONCLUSIONS: In this representative, population-based sample of children and adolescents, moderate decrements in HRQoL were observed after 3 years. Changes were particularly important among girls and in relation to pubertal development. These results could provide useful reference data for other longitudinal studies in population sub-groups.

The adaptation into Spanish of the Coddington Life Events Scales (CLES).

AIMS: To obtain a conceptually and psychometrically equivalent Spanish version of the Coddington Life Events Scales (CLES) for children and adolescents and to test their psychometric properties. METHODS: Forward and backward translations were performed. Comprehension, acceptability, and alternative translations were tested in focus groups and semi-structured interviews. An expert panel and the copyright holders of the original version were actively involved. Test-retest reliability [Intraclass Correlation Coefficient (ICC)] was assessed by administering the questionnaire on two occasions 3 months apart to children aged 12-14 years (n = 30). Construct validity was assessed by comparing children's responses with those of their parents (n = 19). The methods replicated those of the validation of the original version. RESULTS: Of the 53 CLES items translated, ten were found to be difficult to understand. Following back-translation, seven items were modified and a final version was obtained. Test-retest ICC reliability for total scores was 0.63. The ICC between children and parents was 0.42. Both results were very similar to those reported for the original version. CONCLUSIONS: These preliminary findings suggest that the Spanish version of the CLES is understandable and acceptable and that it is similar to the original in terms of validity and reliability. Although further validation is needed, it is recommended for use in research settings in Spain.