Crystal Smit

Chapter 4 82 Table 4.4 Results for the model testing descriptive norms as a moderator of the mean-level differences between conditions on water consumption ( N = 451) Water consumption b SE β p CI Regression paths Active control [1] vs. SNI [0]—Behavior T2 -.00 .19 -.00 .982 -0.20 – 0.20 Control [1] vs. SNI [0]—Behavior T2 -.18 .32 -.10 .584 -0.43 – 0.24 Descriptive norms T1—Behavior T2 .23 .11 .13 .048 0.00 – 0.25 Active control [1] vs. SNI [0] X Descriptive norms T1—Behavior T2 -.13 .13 - .04 .308 -0.13 – 0.04 Control [1] vs. SNI [0] X Descriptive norms T1—Behavior T2 -.38 .16 -.12 .028 -0.23 – -0.01 Active control [1] vs. SNI [0]—Behavior T3 -.31 .24 -.16 .195 -0.40 – 0.08 Control [1] vs. SNI [0]—Behavior T3 -.22 .19 -.11 .249 -0.30 – 0.08 Descriptive norms T1—Behavior T3 -.04 .21 -.02 .844 -0.24 – 0.19 Active control [1] vs. SNI [0] X Descriptive norms T1—Behavior T3 .06 .27 .02 .830 -0.14 – 0.18 Control [1] vs. SNI [0] X Descriptive norms T1—Behavior T3 .23 .28 .07 .399 -0.09 – 0.23 Stability paths Behavior T1—Behavior T2 .49 .06 .45 <.001 0.34 – 0.56 Behavior T2—Behavior T3 .62 .05 .58 <.001 0.50 – 0.65 Note. b , unstandardized regression coefficient estimating the mean-level difference between conditions, adjusted for previous consumption; SE , standard error; β , standardized regression coefficient; CI = 95% confidence interval; SNI, social network intervention; T1, Time 1; T2, Time 2; T3, Time 3; numbers in parentheses represent the binary dummy coded values; SNI is the reference category in the model. Injunctive Norms The last structural pathmodel examined the potential moderating role of injunctive norms on the effectiveness of the social network intervention. This model showed a good fit to the observed data, RMSEA = .06, CFI = .99 and normed c 2 = 2.65. At T2, the main effect of injunctive norms emerged as statistically significant, but this effect was qualified by a significant interaction effect between injunctive norms and the difference among the social network and active control conditions on water consumption, adjusting for water consumption at T1 ( b = .26, SE = .12, β = .14, p = .050, 95% CI [-0.00, 0.28]). There was also a significant interaction effect between injunctive norms and the difference among the social network intervention and control conditions on water consumption, adjusting for water consumption at T1 ( b = .21, SE = .11, β = .11, p = .050, 95% CI [0.00, -0.22]; see Table 4.5).