Janssen Evelien H C, Singh Amika S, van Nassau Femke, Brug Johannes, van Mechelen Willem, Chinapaw Mai J M
1 Department of Public and Occupational Health, VU University Medical Center, EMGO Institute for Health and Care Research, Van der Boechorststraat 7, 1081 BT Amsterdam, The Netherlands.
2 Department of Epidemiology and Biostatistics, VU University Medical Center, EMGO Institute for Health and Care Research, Amsterdam, The Netherlands.
Public Health Nutr. 2014 Feb;17(2):277-86. doi: 10.1017/S1368980012005253. Epub 2012 Dec 10.
Adequate assessment of energy balance-related behaviours in adolescents is essential to develop and evaluate effective obesity prevention programmes. The present study examined the test-retest reliability and construct validity of a questionnaire assessing energy balance-related behaviours in adolescents during the evaluation of the DOiT (Dutch Obesity Intervention in Teenagers) intervention.
To assess test-retest reliability, adolescents filled in the questionnaire twice (n 111). To assess construct validity, the results from the first test were compared with data collected in a personal cognitive interview (n 20, independent from the reliability study). For both reliability and validity, intraclass correlation coefficients for continuous data or Cohen's kappa coefficients for categorical data were calculated as well as percentage agreement.
Data were collected during school time from February to May 2010.
Study participants were Dutch adolescents aged 12-14 years attending pre-vocational secondary schools.
In more than three-quarters of the ninety-five questionnaire items the test-retest reliability appeared to be good to excellent. Moderate reliability was found for all other twenty-one items. Fifty-one items (of ninety-five items) showed good to excellent construct validity. Construct validity appeared moderate in twenty-three items and poor in twenty-one items. Most items with poor construct validity concerned consumption of sugar-containing beverages and high-energy snacks/sweets.
Our study showed good test-retest reliability and largely moderate to good construct validity for the majority of items of the DOiT questionnaire. Items with poor construct validity (most of them found for items concerning energy intake-related behaviours) should be revised and tested again to improve the questionnaire for future use.
充分评估青少年与能量平衡相关的行为对于制定和评估有效的肥胖预防计划至关重要。本研究在评估“荷兰青少年肥胖干预”（DOiT）干预措施期间，检验了一份评估青少年与能量平衡相关行为的问卷的重测信度和结构效度。
为评估重测信度，青少年填写问卷两次（n = 111）。为评估结构效度，将首次测试的结果与在个人认知访谈中收集的数据进行比较（n = 20，独立于信度研究）。对于信度和效度，计算连续数据的组内相关系数或分类数据的科恩kappa系数以及一致性百分比。
数据于2010年2月至5月在校期间收集。
研究参与者为荷兰12至14岁就读于职业前中学的青少年。
在九十五个问卷项目中，超过四分之三的项目重测信度显示为良好至优秀。其他二十一个项目的信度为中等。九十五个项目中的五十一个项目显示出良好至优秀的结构效度。二十三个项目的结构效度中等，二十一个项目的结构效度较差。结构效度差的大多数项目涉及含糖饮料和高能量零食/糖果的消费。
我们的研究表明，DOiT问卷的大多数项目具有良好的重测信度，并且在很大程度上结构效度为中等至良好。结构效度差的项目（其中大多数与能量摄入相关行为的项目有关）应进行修订并再次测试，以改进问卷以便将来使用。
