Stability of and Associations Between Social-Cognitive Determinants Over Time

1. Barbara Sassen[1][1] 2. Gerjo Kok[2][2] 3. Jan Schepers[3][3] 4. Luc Vanhees[4][4] 1. 1University of Applied Sciences, Utrecht, The Netherlands 2. 2Maastricht University, The Netherlands 3. 3Maastricht University, The Netherlands 4. 4University of Leuven, Belgium 1. Barbara Sassen, University of Applied Sciences, Bolognalaan 101, Utrecht, 3584 CJ, Netherlands. Email: Barbara.Sassen{at}hu.nl This study reports on the stability of social-cognitive determinants, and on associations between social-cognitive determinants to show insight in the theory of planned behavior (TPB). In all, 278 health professionals who encourage patients to become physically active completed online TPB-based surveys at baseline (Time 1 [T1]) and six months later (Time 2 [T2]). No intervention took place. No differences were found for all social-cognitive determinants measured at T1 compared with T2 (6 months later), except for intention ( t test = 5.18, p < .001). Structural equation modeling—χ2(5, N = 278) = 2.35, p = .80, root mean square error of approximation = 0.00—showed that behavior T1 and attitude T1 predicted intention T1 ( R 2 = .57, p =