Table 4.
Results of the linear mixedmodel of the effects of the intervention on physical activity in Study 2.
| Outcome measures | Control group (n = 43) Mean (SD) | Implementation intention group (n = 48) Mean (SD) | Mental simulation group (n = 47) Mean (SD) | Mental simulation plus implementation intention group (n = 46) Mean (SD) | Fmental simulation × implementation intention | Effect size (main effect of implementation intention)c | Effect size (main effect of mental simulation)d | Effect size (interaction effect of mental simulation and implementation intention)e | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| d | 95%CIb | d | 95%CIb | d | 95%CIb | ||||||
| Fitness center attendance (T1) | 7.33 (4.93) | 6.23 (4.37) | 7.47 (5.01) | 7.30 (5.62) | |||||||
| Fitness center attendance (T2) | 10.77 (7.04) | 9.40 (5.91) | 11.15 (7.48) | 10.46 (7.96) | 0.36 | 0.01 | -0.36; 0.39 | 0.09 | -0.29; 0.46 | 0.08 | -0.30; 0.46 |
| Fitness center attendance (T3)a | 19.42 (12.18) | 16.22 (11.16) | 19.45 (11.89) | 16.92 (10.70) | 0.06 | 0.10 | -0.35; 0.55 | 0.05 | -0.40; 0.50 | 0.14 | -0.38; 0.65 |
T1, Time 1; T2, Time 2; T3, Time 3.
aSample size for all groups, n = 20.
b95%CI = 95% confidence interval of the effect size.
cEffect sizes for the mental simulation and implementation intention group and implementation intention group vs. Mental simulation group and control group comparisons at T2 and T3 controlling for T1.
dEffect sizes for the mental simulation and implementation intention group and mental simulation group vs. Implementation intention group and control group comparisons at T2 and T3 controlling for T1.
eEffect sizes for the mental simulation and implementation intention group vs. Mental simulation group and implementation intention group and control group comparisons at T2 and T3 controlling for T1.