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 (n5378). 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 a50.62-0.85; the test-retest reliability coefficients, r50.62-0.82), 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.

This study aimed to examine the scale for reliability and validity of the dietary information literacy scale for competition (DILS-C) in college athletes. This cross-sectional study was performed using a self-report questionnaire for college athletes who belong to the club of the university located in Ibaraki prefecture, Japan, from October to December 2014. The final sample comprised 953 college athletes, 684 males and 269 females, aged 18 to 22 y. Following item selection by exploratory factor analysis, the scale's reliability and validity were examined via internal consistency and confirmatory factor analysis. Furthermore, a retest for 376 athletes was conducted at about 3-wk intervals. Factor analysis of literacy measure indicated that the scale consists two sub-scales-communicative literacy and critical literacy. The Cronbach's a coefficient assessing the internal consistency reliability was acceptable (communicative literacy50.84, critical literacy50.79). Excellent goodness-offit indices of communicative and critical literacy were obtained by confirmatory factor analysis (GFI50.95, AGFI50.92, CFI50.95, RMSEA50.08). Retest reliability was within an allowable range (communicative literacy ICC50.52, critical literacy ICC50.50). The present study suggested that the reliability and factorial validity were confirmed in the DILS-C in college athletes.

Background: This study aimed to develop the decisional balance scale for dietary behavior appropriate for college athletes and to examine the scale for reliability and validity. Methods: The cross-sectional study was performed using a self-report questionnaire for college athletes who belong to the sports club of a university located in Ibaraki, Japan, from October to December 2014. The final sample comprised 982 college athletes (704 males and 278 females) aged 18 to 22 years. Following item selection by exploratory factor analysis, the scale’s reliability and validity were examined by internal consistency, confirmatory factor analysis, and association of stage of change with the scale score. Furthermore, a retest for 378 athletes was conducted after about a 3-week interval. Results: Nine items (4 troublesome items, 3 repressed items, 2 compulsory items) classified for three types of burden factors were obtained through factor analysis. There were significant differences according to the stage of change in the troublesome and repressed factors (P < 0.05), consistent with the transtheoretical model. As a result of confirmatory factor analysis with two factors, excluding the compulsory factor, we obtained higher goodness of fit (GFI = 0.99, AGFI = 0.97, CFI = 0.97, RMSEA = 0.06). The Cronbach’s alpha coefficient and the intra-class correlation in each factor were as follows: troublesome = 0.73/0.66, repressed = 0.69/0.61. In addition, we observed moderate consistency for the retesting stage of change (kappa coefficient = 0.50). Conclusions: The present study suggested sufficient reliability and validity, which were confirmed in the burden scale for dietary behavior appropriate for college athletes.