Does participation in an intervention affect responses on self-report questionnaires?

被引:22
作者
Baranowski, Tom [1 ]
Allen, Diane D.
Masse, Louise C.
Wilson, Mark
机构
[1] Baylor Coll Med, Dept Pediat, Houston, TX 77030 USA
[2] Univ Calif Berkeley, Coll Educ, Berkeley, CA 94720 USA
[3] Univ British Columbia, Dept Pediat, Ctr Community Child Hlth Res, Vancouver, BC V6H 3V4, Canada
基金
美国农业部;
关键词
D O I
10.1093/her/cyl087
中图分类号
G40 [教育学];
学科分类号
040101 ; 120403 ;
摘要
There has been some concern that participation in an intervention and exposure to a measurement instrument can change participants' interpretation of the items on a self-report questionnaire thereby distorting subsequent responses and biasing results. Differential item functioning (DIEF) analysis using item response modeling can ascertain possible differences in item interpretation by testing for differences in item location between groups. The DIF for treatment versus control group differences at post-intervention assessment and the Time 1 and Time 2 differences in a control group were analyzed using data from a dietary change intervention trial for Boy Scouts. The measures included fruit and vegetable (FV) frequency of consumption, preferences and self-efficacy. Treatment-control group DIF at postintervention assessment was detected in a higher percentage of items for FV frequency than for preference or self-efficacy. Time 1 to Time 2 differences in items for the control group were detected in one item for each of the three scales. Further research will need to clarify whether the obtained DIFs reflected true changes in frequency, preference or self-efficacy or some reinterpretation of items by participants following an intervention or merely after previous exposure to the measure.
引用
收藏
页码:98 / 109
页数:12
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