Caffeine intake (mg) on a given day for all children (ages 6–11 years) overall and by screen time variables*
| n† | Median | 25th percentile | 75th percentile | 90th percentile | 95 percentile | P values‡ | |
| All | 3421 | 4.4 | 0.0 | 24.6 | 58.6 | 85.8 | |
| Total screen time | NS | ||||||
| <2 hours | 807 | 3.7 | 0.0 | 16.0 | 42.5 | 69.1 | |
| ≥2 hours | 2474 | 4.7 | 0.0 | 28.2 | 62.0 | 94.9 | |
| Television watching | 0.02 | ||||||
| <2 hours | 1138 | 3.4 | 0 | 15.5 | 43.7 | 81.3 | |
| ≥2 hours | 2143 | 4.9 | 1.0 | 30.2 | 62.3 | 93.6 | |
| Computer use | NS | ||||||
| <2 hours | 2605 | 4.3 | 0.0 | 23.2 | 55.5 | 82.5 | |
| ≥2 hours | 678 | 4.8 | 0.0 | 31.1 | 84.6 | 119.0 | |
*Medians and percentiles were calculated from untransformed weighted data; 5th and 10th percentiles are not presented and were essentially equal to zero because of a high proportion of children who did not consume any caffeine.
†Unweighted n.
‡All statistical tests were performed on log-transformed means.