title: Evaluations of Validity and Reliability of a Transtheoretical Model for Sedentary Behavior among College Students.
abstract: 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.
authors.affiliation: Department of Kinesiology and Health Education, The University of Texas at Austin, Austin, TX, USA. hanho@utexas.edu.
authors.forename: Ho
authors.initials: H
authors.lastname: Han
authors.affiliation: Epidemiology, Human Genetics, and Environmental Sciences, University of Texas School of Public Health, Austin, TX, USA.
authors.forename: Kelley Pettee
authors.initials: KP
authors.lastname: Gabriel
authors.affiliation: Epidemiology, Human Genetics, and Environmental Sciences, University of Texas School of Public Health, Austin, TX, USA.
authors.forename: Harold Willis
authors.initials: HW
authors.lastname: Kohl
mesh_terms: D000293:Adolescent; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008960:Models, Psychological; D011594:Psychometrics; D015203:Reproducibility of Results; D057185:Sedentary Behavior; D013334:Students / Q000523:psychology*; D011795:Surveys and Questionnaires / Q000592:standards*; D014495:Universities; D055815:Young Adult