Table 3.

Multiple linear regressions investigating the longitudinal effect of perceived peer descriptive norms and self-control on frequency of unhealthy food/drinks consumption in university students.

	A. Cakes/pastries		B. Sugar containing sodas		C. Alcohol
	B (SE)	95% CI	B (SE)	95% CI	B (SE)	95% CI
Age	0.010 (0.014)	−0.016–0.037	−0.036 (0.019)	−0.073–0.002	−0.017 (0.007)*	−0.031–−0.003
Gender	−0.340 (0.160)*	−0.654–−0.026	−0.328 (0.231)	−0.783–0.127	−0.028 (0.085)	−0.195–0.138
BMI	0.012 (0.013)	−0.014–0.038	0.032 (0.019)	−0.005–0.069	−0.002 (0.007)	−0.016–0.011
Baseline Freq.	0.516 (0.050)**	0.418–0.613	0.636 (0.042)**	0.553–0.719	0.621 (0.044)**	0.534–0.708
Baseline Norm	0.377 (0.131)**	0.119–0.635	0.100 (0.207)	−0.306–0.506	0.127 (0.093)	−0.056–0.311
BSCS	−0.019 (0.008)*	−0.035–−0.002	−0.021 (0.012)	−0.045–0.003	0.001 (0.005)	−0.008–0.010
Norm change	0.387 (0.125)**	0.141–0.632	0.114 (0.155)	−0.191–0.418	0.111 (0.074)	–0.034–0.256
Baseline norm*BSCS	−0.025 (0.015)	−0.055−0.005	−0.012 (0.028)	−0.069−0.042	−0.011 (0.010)	−0.030–0.009
Norm change*BSCS	−0.028 (0.017)	−0.061–0.005	0.001 (0.020)	−0.040–0.040	−0.017 (0.009)	−0.036–0.001
	R2-Change	F-change	R2-Change	F-change	R2-Change	F-change
Step 1	0.31	36.68**	0.46	69.09**	0.551	84.77**
Step 2	<0.01	1.99	<0.01	0.01	<0.01	0.21
Step3	0.03	8.28**	0.01	1.96	<0.01	1.00
Step 4	0.01	1.66	<0.01	0.12	0.01	1.75

^*p < 0.05;

^**p < 0.01.

B, unstandardised co-efficient; BMI, Body Mass Index; BSCS, Brief Self-Control Scale scores; Baseline Frequency, self-reported behavior at baseline; Baseline Norm, perceived peer norms at baseline. Norm Change, change in perceived peer norms between baseline and follow up; T1 Norm^*BSCS, the interaction between perceived peer norms at baseline and self-control scores; Norm Change^*BSCS, the interaction between change in perceived peer norms and self-control scores; Estimates from the final step of each regression (step four) are reported.