Table 2.
Descriptive statistics
| SES strata | N pairs | Mean boys | Variance boys | Mean girls | Variance girls | Total mean | Total variance |
|---|---|---|---|---|---|---|---|
| The Netherlands | |||||||
| SES low | 2109 | 6.64 | 31.08 | 5.29 | 23.16 | 5.96 | 27.55 |
| SES medium | 5143 | 6.07 | 28.20 | 4.68 | 20.52 | 5.37 | 24.77 |
| SES high | 4730 | 5.04 | 24.57 | 3.75 | 14.68 | 4.40 | 20.05 |
| Total | 12,046 | 5.77 | 27.74 | 4.43 | 19.08 | 5.09 | 23.83 |
| The United Kingdom | |||||||
| SES low | 1372 | 2.59 | 3.91 | 2.06 | 3.13 | 2.27 | 3.49 |
| SES medium | 5059 | 1.96 | 3.13 | 1.60 | 2.33 | 1.74 | 2.66 |
| SES high | 3265 | 1.61 | 2.40 | 1.24 | 1.82 | 1.40 | 2.08 |
| Total | 9822 | 1.88 | 2.98 | 1.51 | 2.29 | 1.69 | 2.66 |