Table 5.
Mean differences and ratios of total individual costs (in £ at 1998 prices) by age 28 according to personal characteristics and educational factors at age 10*
| No | Mean difference | t test (signifi cance) | Bootstrap mean difference (95% CI) | Bootstrap ratio (95% CI) | |
|---|---|---|---|---|---|
| Sex | |||||
| Male | 873 | 12 297 | 9.78 (P<0.00 1) | 12 339 (6 440 to 19 057) | 4.37 (2.17 to 8.32) |
| Female | 695 | ||||
| Parental social class | |||||
| Low | 612 | 6 218 | 4.00 (P<0.00 1) | 6 341 (−980 to 14 820) | 1.83 (0.85 to 3.28) |
| High† | 955 | ||||
| Reading age | |||||
| <7.5 years | 120 | 8 235 | 2.99 (P=0.00 3) | 8 525 (−1 577 to 26 457) | 1.96 (0.87 to 3.93) |
| ⩾7.5 years‡ | 1426 | ||||
| No of primary school attended | |||||
| ⩾3 | 144 | 11 977 | 4.39 (P<0.00 1) | 12 486 (−2 818 to 30 859) | 2.48 (0.71 to 4.80) |
| 1 or 2 | 1402 | ||||
Bootstrap estimation using 2000 repetitions, bias corrected.
*
Irrespective of conduct group. Sample reweighted to represent screened population studied (n= 1567); numbers vary due to missing data.
†
Registrar general's social classes I, II, and III non-manual versus III manual, IV, V, and unknown.
‡
Neale reading comprehension.