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Proportion of correct responses and direction of errors for the estimation of portion sizes in the total sample.
| Portion size | Correct (%) | Underestimateda (%) | Overestimatedb (%) |
|---|---|---|---|
| Small | 64.9 | 0 | 35.1 |
| Medium | 45.9 | 19.7 | 34.4 |
| Large | 41.0 | 32.4 | 26.7 |
| Extra large | 43.8 | 56.2 | 0 |
| All portions | 49.4 | 20.4 | 30.2 |
Underestimated—selected portion estimate was lower than served.
Overestimated—selected portion was bigger than the served one.
