Table 4.
Questionnaire Results
| Variable | Unadjusted Results |
Adjusted for Covariates* |
||||
|---|---|---|---|---|---|---|
| Caffeine Mean (SD) | Placebo Mean (SD) | Mean Difference† (95% CI) | P Value | Mean Difference† (95% CI) | P Value | |
| Pediatric Sleep Questionnaire Sleep-Related Breathing Disorder Scale | ||||||
| n | 94 | 99 | ||||
| Result | 0.23 (0.19) | 0.27 (0.20) | −0.03† (−0.09 to 0.02) | 0.23 | −0.04† (−0.10 to 0.02) | 0.15 |
| Restless Legs Syndrome Questionnaire | ||||||
| n‡ | 87 | 82 | ||||
| Result | 3.7 (4.0) | 4.5 (5.0) | −0.8† (−2.2 to 0.5) | 0.23 | −1.0† (−2.3 to 0.4) | 0.17 |
Definition of abbreviation: CI = confidence interval.
*
Covariates: center, age at assessment, sex, race, and maternal education.
†
Quantitative data shown as caffeine − placebo mean difference, estimated by a multiple linear regression model.
‡
The Restless Legs Syndrome Questionnaire was added later in the study, resulting in a lower n.