Outcome | Intervention N = 2223 n (%) | Control N = 2224 n (%) | Risk difference (unadjusted) (%) | Odds ratio (95% CI) Intervention vs. control | p value | |
---|---|---|---|---|---|---|
Primary | Both questionnaires returned | 1577 (71) | 1511 (68) | 3 | 1.15 (1.01–1.31) | 0.030 |
1.15a (1.01–1.31) | 0.036 | |||||
1.16b (1.02–1.33) | 0.021 | |||||
Secondary | At least one of questionnaires returned | 1809 (81) | 1787 (80) | 1 | 1.07 (0.92–1.24) | 0.385 |
1.07a (0.90–1.28) | 0.463 | |||||
1.07b (0.92–1.25) | 0.348 | |||||
Six-month questionnaire returned | 1739 (78) | 1701 (76) | 2 | 1.10 (0.95–1.27) | 0.165 | |
1.10a (0.94–1.30) | 0.233 | |||||
1.11b (0.96–1.28) | 0.149 | |||||
12-month questionnaire returned | 1647 (74) | 1597 (72) | 2 | 1.12 (0.98–1.28) | 0.087 | |
1.12a (0.98–1.28) | 0.086 | |||||
1.14b (0.99–1.29) | 0.062 |