Table 6.
Factors at age 10 predicting total cost (in £ at 1998 prices) by age 28, determined by multiple linear regression analysis
| Variable | Regression coefficient | Standardised regression coefficient β | t test (significance) | Bootstrap regression coefficient (95% CI) |
|---|---|---|---|---|
| Sex | 12 406 | 0.29 | 12.2 (P<0.001) | 12 076 (6 022 to 20 808) |
| Parental social class* | 3 092 | 0.14 | 6.0 (P<0.001) | 3 035 (408 to 6 458) |
| Reading age† | 6 730 | 0.19 | 7.2 (P<0.001) | 6 829 (1 757 to 12 076) |
| No of primary schools attended | 14 902 | 0.21 | 9.08 (P<0.001) | 15 226 (1 818 to 34 049) |
| Conduct problems | 13 090 | 0.18 | 7.8 (P<0.001) | 12 987 (3 263 to 25 449) |
| Conduct disorder | 31 372 | 0.23 | 10.3 (P<0.001) | 31 253 (7 803 to 65 334) |
| Residual constant | 7 422 | 2.8 (P=0.003) | 7 905 (−5 696 to 21 035) |
Ordinary least squares regression adjusted R2=0.26. Bootstrap regression with 2000 repetitions, bias corrected.
*
Registrar general's social classes I, II, and III non-manual; III skilled manual; IV and V; unknown.
†
Neale reading comprehension above 130 months, 90-130, below 90.