Table 1.
Characteristics of cases and controls and univariate associations between risk factors and medicinal poisoning
| Characteristic | Cases (%), n = 1316 | Controls (%), n = 12 836 | Unadjusted odds ratio (95% CI) |
|---|---|---|---|
| Child characteristics | |||
| Sex of child | |||
| Female | 627 (48) | 6284 (49) | 1.00 |
| Male | 689 (52) | 6552 (51) | 1.05 (0.94 to 1.18) |
| Age when poisoning occurred, months | |||
| 0–12 | 108 (8) | 4272 (33) | 1.00 |
| 13–24 | 430 (33) | 2799 (22) | 6.22 (5.01 to 7.74) |
| 25–36 | 516 (39) | 2308 (18) | 9.24 (7.44 to 11.47) |
| ≥37 | 262 (20) | 3457 (27) | 3.15 (2.49 to 3.97) |
| Birth order of child | |||
| 1st | 853 (65) | 9093 (71) | 1.00 |
| 2nd | 390 (30) | 3192 (25) | 1.34 (1.17 to 1.53) |
| 3rd or more | 73 (5) | 551 (4) | 1.48 (1.14 to 1.92 |
| Maternal characteristics | |||
| Maternal age at birth of child, years | |||
| <20 | 111 (8) | 733 (6) | 1.00 |
| 20–29 | 724 (55) | 6308 (49) | 0.75 (0.60 to 0.93) |
| 30–39 | 448 (34) | 5481 (43) | 0.53 (0.42 to 0.66) |
| ≥40 | 33 (3) | 314 (2) | 0.67 (0.44 to 1.02) |
| Maternal diagnosis of depression | |||
| No | 1177 (89) | 11 938 (93) | 1.00 |
| Yes | 139 (11) | 898 (7) | 1.58 (1.31 to 1.92) |
| Maternal smoking | |||
| Never smoked | 586 (44) | 6414 (50) | 1.00 |
| Ex-smoker | 63 (5) | 556 (4) | 1.26 (0.95 to 1.66) |
| Current smoker | 343 (26) | 2809 (22) | 1.35 (1.17 to 1.56) |
| Missing | 324 (25) | 3057 (24) | 1.17 (0.99 to 1.37) |
| Maternal alcohol misuse | |||
| Never | 1299 (98.71) | 12 774 (99.52) | 1.00 |
| ≤1 year before poisoning | 7 (0.53) | 12 (0.09) | 5.54 (2.17 to 14.15) |
| >1 year before poisoning | 10 (0.76) | 50 (0.39) | 1.99 (1.00 to 3.93) |
| Social characteristics | |||
| Townsend index quintile | |||
| 1 (least deprived) | 260 (20) | 2843 (22) | 1.00 |
| 2 | 200 (15) | 2370 (18) | 0.93 (0.76 to 1.13) |
| 3 | 252 (19) | 2439 (19) | 1.17 (0.96 to 1.41) |
| 4 | 266 (20) | 2300 (18) | 1.35 (1.12 to 1.65) |
| 5 (most deprived) | 242 (19) | 1876 (15) | 1.57 (1.28 to 1.93) |
| Missing | 96 (7) | 1008 (8) | 0.94 (0.63 to 1.39) |
| Single parenthood | |||
| Single adult | 581 (44) | 4906 (38) | 1.00 |
| Two adults | 646 (49) | 6817 (53) | 0.78 (0.69 to 0.89) |
| Other | 89 (7) | 1113 (9) | 0.66 (0.52 to 0.84) |