Before group (n = 459) | After group (n = 464) | Unadjusted effect measure (95% CI)a | p value | Adjusted effect measure (95% CI)ab | p value | |
---|---|---|---|---|---|---|
Questionnaire received (at 2 years of age corrected for prematurity)c, n/N (%) | 381/459 (83.0) | 353/464 (76.1) | 6.9 (1.7, 12.1) | 0.009 | 6.8 (1.6, 12.0) | 0.010 |
Method of completion: | ||||||
Paper questionnaire, n/N (%) | 326/459 (71.0) | 295/464 (63.6) | 0.061f | |||
Online completion, n/N (%) | 50/459 (10.9) | 53/464 (11.4) | ||||
Completion via telephone, n/N (%) | 5/459 (1.1) | 5/464 (1.1) | ||||
Total cost of the strategyd (£) | ||||||
Mean (SD) | 17.97 (1.7) | 15.00 (6.7) | 2.97 (2.33, 3.60) | < 0.001 | 2.98 (2.34, 3.61) | < 0.001 |
Median (IQR) | 18.22 (17.41 to 18.40) | 18.08 (18.08 to 18.88) | ||||
Increase in cost compared to prior to commencement of incentives study (£, 95% CI) | 14.80 (14.68, 14.94) | 11.84 (11.51, 12.12) | ||||
Reminder requirede, n/N (%) | 248/456 (54.4) | 264/452 (58.4) | ||||
0 | 208/456 (45.6) | 188/452 (41.6) | ||||
1 | 104/456 (22.8) | 95/452 (21.0) | 0.027g | |||
2 | 43/456 (9.4) | 31/452 (6.9) | ||||
3 | 101/456 (22.1) | 138/ 452 (30.5) | ||||
Missing | 3 | 12 |