Test-retest reliability and construct validity of the ENERGY-child questionnaire on energy balance-related behaviours and their potential determinants: the ENERGY-project
1 VU University Medical Center, EMGO Institute for Health and Care Research, Dpt. of Public and Occupational Health, Amsterdam, the Netherlands
2 University of Agder, Department of Public Health, Sport and Nutrition, Kristiansand, Norway
3 Ghent University, Department of Movement and Sport Sciences, Gent, Belgium
4 GENUD (Growth, Exercise, NUtrition and Development) Research Group, Escuela Universitaria de Ciencias de la Salud, Universidad de Zaragoza, Zaragoza, Spain
5 University of Pécs, Department of Paediatrics, Pecs, Hungary
6 Harokopio University, Department of Nutrition and Dietetics, Athens, Greece
7 ResCon, Amsterdam, the Netherlands
8 VU University Medical Center, EMGO Institute for Health and Care Research, Amsterdam, the Netherlands
International Journal of Behavioral Nutrition and Physical Activity 2011, 8:136 doi:10.1186/1479-5868-8-136Published: 9 December 2011
Insight in children's energy balance-related behaviours (EBRBs) and their determinants is important to inform obesity prevention research. Therefore, reliable and valid tools to measure these variables in large-scale population research are needed.
To examine the test-retest reliability and construct validity of the child questionnaire used in the ENERGY-project, measuring EBRBs and their potential determinants among 10-12 year old children.
We collected data among 10-12 year old children (n = 730 in the test-retest reliability study; n = 96 in the construct validity study) in six European countries, i.e. Belgium, Greece, Hungary, the Netherlands, Norway, and Spain. Test-retest reliability was assessed using the intra-class correlation coefficient (ICC) and percentage agreement comparing scores from two measurements, administered one week apart. To assess construct validity, the agreement between questionnaire responses and a subsequent face-to-face interview was assessed using ICC and percentage agreement.
Of the 150 questionnaire items, 115 (77%) showed good to excellent test-retest reliability as indicated by ICCs > .60 or percentage agreement ≥ 75%. Test-retest reliability was moderate for 34 items (23%) and poor for one item. Construct validity appeared to be good to excellent for 70 (47%) of the 150 items, as indicated by ICCs > .60 or percentage agreement ≥ 75%. From the other 80 items, construct validity was moderate for 39 (26%) and poor for 41 items (27%).
Our results demonstrate that the ENERGY-child questionnaire, assessing EBRBs of the child as well as personal, family, and school-environmental determinants related to these EBRBs, has good test-retest reliability and moderate to good construct validity for the large majority of items.