Table 5.
Portion size selection, consumption and portion size evaluations per condition on day 2 (n = 132).
| Smaller Portion Size Condition (n = 68) | Larger Portion Size Condition (n = 64) | Test Statistic | p-Value | d | |
|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | ||||
| Effect of condition on consumption | |||||
| Portion size selection (grams) | 401.64 (115.25) | 505.24 (135.00) | t(130) = −4.75 | <0.001 | 0.83 |
| Consumption (grams) | 382.57 (104.70) | 471.81 (120.91) | t(130) = −4.54 | <0.001 | 0.79 |
| Effect of condition on perceptions of portion size normality | |||||
| Perceptions of portion size normality a | 3.04 (1.09) | 3.38 (1.43) | t(130) = −1.26 | 0.21 | 0.22 |
| Effect of condition on perceptions of descriptive norms, injunctive norms, personal norms and expected satiety | |||||
| Perceptions of descriptive norms a | 2.59 (1.03) | 3.06 (1.09) | t(130) = −2.67 | 0.01 | 0.46 |
| Perceptions of injunctive norms a | 2.68 (0.91) | 3.18 (1.14) | t(130) = −2.66 | 0.01 | 0.46 |
| Personal norms a | 2.99 (1.14) | 3.39 (1.56) | t(130) = −1.19 | 0.24 | 0.21 |
| Expected satiety a | 3.60 (1.36) | 4.00 (1.63) | t(130) = −1.25 | 0.22 | 0.22 |
a Measured by a 9-point scale (range 1–9). Note: All reported means and standard deviations are untransformed scores for ease of interpretation.