252 Chapter 5 Table 8 Hierarchical linear regression analyses predicting overall GSR percent change Dependent Variable Overall GSR percent change Unstandardized estimate b [95% CI] (SE) Step 1 b Constant 25.25 [ 11.67; 40.90] ** (7.32) Trailer-condition a 16.25 [-9.82; 47.91] (14.63) Step 2a c Constant 25.26 [ 10.62; 40.91] ** (7.33) Trailer-condition a 16.56 [-9.53; 50.74] (15.10) Motivation to change - 6.34 [-41.29; 37.75] (20.28) Interaction: motivation to change X trailer-condition 15.42 [-66.11; 87.64] (38.67) Step 2b d Constant 25.15 [ 11.81; 39.61] ** (7.14) Trailer-condition a 16.02 [-12.61; 46.60] (15.05) General anxiety symptoms 13.49 [-2.69; 30.47] (8.03) Interaction: general anxiety symptoms X trailer-condition -25.67 [-69.94; 32.48] (25.67) Notes. * p < .05, ** p < .01, *** p < .001, 1.000 bootstrap samples. Steps 1 and 2a were performed within the same bootstrapped regression model. a Trailer-condition was coded as 0 = entertainment trailer, 1 = mental health trailer. b R2 = .03. c R2 = .03. d R2 = .06. CI, confidence interval; SE, standard error; GSR, galvanic skin response.
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