Table 1.
Distribution of variables across the complete case and imputed datasets for substance use outcomes
| Variable | Reference | Complete case sample (n = 2047) | Imputed sample (n = 8041) | ||
|---|---|---|---|---|---|
| Median (IQR) | N(%) | Median (IQR) | N(%) | ||
| Harmful alcohol use | Non-harmful drinking (harmful drinking) | 77(3.8%) | 548(6.8%) | ||
| Weekly smoking | Not weekly smoker (weekly smoker) | 226 (11.0%) | 983 (12.2%) | ||
| Cannabis | Not used (used) | 562 (27.5%) | 2406 (29.9%) | ||
| Other drugs | Not used (used) | 217 (10.6%) | 1067 (13.3%) | ||
| Maternal crime | No criminal record (a criminal record) | 91 (4.4%) | 507 (6.3%) | ||
| Maternal substance misuse | No substance misuse (misused substances) | 386 (18.9%) | 1543 (19.2%) | ||
| Maternal smoking | Smoker (non-smoker) | 232 (11.3%) | 1605 (20.0%) | ||
| Sex assigned at birth | Male (Female) | 1105 (54.0%) | 3966 (49.3%) | ||
| Maternal education | A level or higher (No education/CSE/vocational; GCSE) |
253 (12.4%) 676 (33.0%) |
1800 (22.4%) 2846 (35.4%) |
||
| Social class | Non-manual (manual) | 131 (6.4%) | 821 (10.2%) | ||
| Home status | Owned (rented) | 221 (10.8%) | 1536 (19.2%) | ||
| Financial problems | No problems (had problems) | 168 (8.2%) | 875 (10.9%) | ||
| Financial hardship | No difficulties (had difficulties) | 312 (15.2%) | 1796 (22.3%) | ||
| Maternal age at birth of study child | 30 (6) | 29 (6) | |||
| Marital status | Not single (single) | 254 (12.4%) | 1535 (19.1%) | ||
| Maternal anxiety | 4 (4) | 4 (5) | |||
| Maternal depression | 5 (5) | 6 (6) | |||
| Maternal stressful life events | 3 (3) | 3 (3) | |||