| Mother database | Father database | ||||
---|---|---|---|---|---|---|
 | Retained (n = 564) | Not retained (n = 316) | p-value for difference | Retained (n = 454) | Not retained (n = 426) | p-value for difference |
Age, y, mean (sd) | 20.3 (0.7) | 20.6 (0.8) | <0.0001 | 20.3 (0.7) | 20.5 (0.8) | <0.0001 |
Male % | 46.6 | 44.8 | 0.6604 | 47.0 | 44.7 | 0.5323 |
Mother university-educated, % | 46.7 | 43.6 | 0.6654 | 49.2 | 39.5 | 0.0090 |
Household income, % | Â | Â | Â | Â | Â | Â |
<$30,000 | 36.7 | 47.5 | 0.0057 | 35.9 | 45.4 | 0.0002 |
$30,000- | 44.7 | 41.5 | Â | 42.9 | 44.5 | Â |
$99,999 | 18.6 | 11.0 | Â | 21.3 | 10.1 | Â |
≥$100,000 |  |  |  |  |  |  |
Canadian born, % | 95.6 | 89.5 | 0.0009 | 95.8 | 90.8 | 0.0044 |
French-speaking,% | 33.6 | 27.9 | 0.1774 | 28.4 | 33.6 | 0.1040 |