Table 2.
Representativeness of children in cohort
| Invited, not enrolled (N = 9832) | (Percentage) | Enrolled (N = 485) | (Percentage) | Chi-squared p value | |
|---|---|---|---|---|---|
| Age, years median (IQR) | 6 (3–10) | 4 (3–7) | < 0.001* | ||
| Female, N (%) | 4824 | (49.1) | 245 | (50.5) | 0.53 |
| IMD decile, N (%): | < 0.001 | ||||
| 1 (Most deprived) | 2301 | (23.4) | 42 | (8.7) | |
| 2 | 889 | (9.1) | 44 | (9.1) | |
| 3 | 1316 | (13.4) | 43 | (8.9) | |
| 4 | 1151 | (11.7) | 59 | (12.2) | |
| 5 | 339 | (3.5) | 16 | (3.3) | |
| 6 | 352 | (3.6) | 46 | (9.5) | |
| 7 | 960 | (9.8) | 65 | (13.4) | |
| 8 | 1640 | (16.7) | 109 | (22.5) | |
| 9 | 395 | (4) | 25 | (5.2) | |
| 10 (Least deprived) | 485 | (4.9) | 36 | (7.4) |
Four children in not-enrolled group had missing data for age and IMD decile. Seven children in enrolled group were not in original mail-out invitation list
*Wilcoxon rank-sum p value