Table 1.
Distribution of main variables (complete case and imputed data)
| Complete case (numbers vary) | Following imputation (n = 7218) | ||
|---|---|---|---|
| Conduct problems | Low | 5061 (70.1%) | Data were complete in this sample |
| Childhood limited | 875 (12.1%) | ||
| Adolescent onset | 616 (8.5%) | ||
| Early-onset persistent | 666 (9.2%) | ||
| Cannabis use | Non-use | 3194 (76.8%) | 76.3% |
| Use | 835 (20.1%) | 19.7% | |
| Problem use | 130 (3.1%) | 4.0% | |
| Housing tenure | Mortgaged/owned | 5885 (83.4%) | 83.2% |
| Private rented | 559 (7.9%) | 8.0% | |
| Subsidized rented | 617 (8.7%) | 8.8% | |
| Parity | First-born | 3295 (46.8%) | 46.8% |
| Second-born | 2511 (35.7%) | 35.7% | |
| Third-born plus | 1230 (17.5%) | 17.5% | |
| Home overcrowding | Up to 1 person/room | 6724 (96.3%) | 96.2% |
| >1 person/room | 262 (3.8%) | 3.8% | |
| Maternal education | A level or higher | 3070 (43.4%) | 43.2% |
| O-level | 2507 (35.5%) | 35.5% | |
| < O-level | 1490 (21.1%) | 21.3% | |
| Household income | Top 20% | 1561 (23.0%) | 22.9% |
| Middle 60% | 4155 (61.3%) | 61.4% | |
| Lowest 20% | 1060 (15.6%) | 15.7% | |
| Social class | Managerial/professional | 4156 (61.5%) | 60.5% |
| III or lower | 2606 (38.5%) | 39.5% | |
| Maternal cannabis | No | 5624 (95.4%) | 95.1% |
| Some use postnatally | 269 (4.6%) | 4.9% | |
| Maternal alcohol | Less than daily | 5273 (83.5%) | 83.6% |
| Daily use | 1043 (16.5%) | 16.4% | |
| Maternal smoking | No | 4775 (77.8%) | 76.1% |
| Some use postnatally | 1363 (22.2%) | 23.9% | |
| Antenatal maternal depressive symptoms | Subthreshold throughout period | 5354 (82.4%) | 81.8% |
| EPDS > 12 at some point | 1145 (17.6%) | 18.2% | |
| Postnatal maternal depressive symptoms | Subthreshold throughout period | 4846 (79.3%) | 78.1% |
| EPDS > 12 at some point | 1266 (20.7%) | 21.9% |
EPDS = Edinburgh Postnatal Depression Scale.