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Evaluations of validity and reliability of a transtheoretical model for sedentary behavior among college students

Han, Ho
Pettee Gabriel, Kelley
Kohl, Harold Willis, III
Objective: To evaluate the measurement properties of the Transtheoretical Model (TTM) questionnaire for sedentary behaviors among college students and to examine the validity and reliability of the developed TTM questionnaire. Methods: Overall, 225 college students were recruited. For the 2-week test-retest reliability, a random sub-sample (N = 108) of the participants was used. Results: Statistically significant differences were found across the stages on the tests of concurrent (X2 = 25.0, p < .001) and construct (p < .01) validity. In addition, the internal consistency reliability (Cronbach alphas from .73 to .88) and test-retest reliability (intra-class correlation coefficients ranging from .80 to .94) were high for the questionnaires. Conclusions: These results demonstrate high validity and reliability of the TTM questionnaire when applied to sedentary behavior.