Kakutani Yuya, Koiwa Akane, Kamiya Saori, Ono Miho, Sasahara Ikuko, Omi Naomi
Faculty of Health and Nutrition, Osaka Shoin Women's University.
Graduate School of Comprehensive Human Science, University of Tsukuba.
J Nutr Sci Vitaminol (Tokyo). 2019;65(4):343-348. doi: 10.3177/jnsv.65.343.
To assess the reliability and validity of the Dietary Supplement Choice Questionnaire (DSCQ) to capture dietary supplement choice motives among Japanese college athletes. The cross-sectional study was performed in 2014. This study recruited 1,451 college athletes from sports-oriented clubs at the University of Tsukuba, Japan. The participants completed the DSCQ, health literacy, and subjective economic status; part of the participants completed a test-retest (n=378). A sample of 975 participants (28.0% female) included in the analysis. The DSCQ was developed through factor analysis. Seven factors emerged, and were labelled "popularity," "functionality," "price," "taste," "convenience," "antidoping" and "familiarity." Mostly acceptable reliability was seen across seven DSCQ factors (the internal consistency, Cronbach's α=0.62-0.85; the test-retest reliability coefficients, r=0.62-0.82), whereas convergent validity for price and antidoping factors was provided by significant associations with economic status and literacy (p<0.01). Findings showed reasonable evidence of reliability and validity of the DSCQ and provided the opportunity to comprehensively assess dietary supplement choice motives among Japanese college athletes.
评估膳食补充剂选择问卷（DSCQ）在捕捉日本大学生运动员膳食补充剂选择动机方面的可靠性和有效性。这项横断面研究于2014年进行。该研究从日本筑波大学以体育为导向的俱乐部招募了1451名大学生运动员。参与者完成了DSCQ、健康素养和主观经济状况调查；部分参与者完成了重测（n = 378）。分析纳入了975名参与者的样本（28.0%为女性）。DSCQ是通过因子分析开发的。出现了七个因子，分别标记为“受欢迎程度”“功能”“价格”“口味”“便利性”“反兴奋剂”和“熟悉度”。七个DSCQ因子的可靠性大多可以接受（内部一致性，Cronbach's α = 0.62 - 0.85；重测信度系数，r = 0.62 - 0.82），而价格和反兴奋剂因子的收敛效度通过与经济状况和素养的显著关联得到体现（p < 0.01）。研究结果显示了DSCQ可靠性和有效性的合理证据，并为全面评估日本大学生运动员的膳食补充剂选择动机提供了机会。
