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Evaluations of Validity and Reliability of a Transtheoretical Model for Sedentary Behavior among College Students.

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 (χ(2) = 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.