Characteristics of cases and controls and univariate associations between risk factors and non-medicinal poisoning
| Characteristic | Cases (%), n = 503 | Controls (%), n = 4873 | Unadjusted odds ratio (95% CI) |
|---|---|---|---|
| Child characteristics | |||
| Sex of child | |||
| Female | 240 (48) | 2372 (49) | 1.00 |
| Male | 263 (52) | 2501 (51) | 1.04 (0.86 to 1.25) |
| Age when poisoning occurred, months | |||
| 0–12 | 67 (13) | 1697 (35) | 1.00 |
| 13–24 | 226 (45) | 1116 (23) | 5.40 (4.05 to 7.20) |
| 25–36 | 159 (32) | 875 (18) | 4.86 (3.58 to 6.60) |
| ≥37 | 51 (10) | 1185 (24) | 1.06 (0.73 to 1.56) |
| Birth order of child | |||
| 1st | 338 (68) | 3607 (74) | 1.00 |
| 2nd | 130 (26) | 1094 (22) | 1.35 (1.08 to 1.68) |
| 3rd or more | 35 (7) | 172 (4) | 2.42 (1.62 to 3.63) |
| Maternal characteristics | |||
| Maternal age at birth of child, years | |||
| <20 | 44 (9) | 249 (5) | 1.00 |
| 20–29 | 293 (58) | 2531 (52) | 0.66 (0.47 to 0.93) |
| 30–39 | 161 (32) | 1987 (41) | 0.46 (0.32 to 0.66) |
| ≥40 | 5 (1) | 106 (2) | 0.26 (0.10 to 0.68) |
| Maternal diagnosis of depression | |||
| No | 454 (90) | 4538 (93) | 1.00 |
| Yes | 49 (10) | 335 (7) | 1.46 (1.06 to 2.01) |
| Maternal smoking | |||
| Never smoked | 201 (40) | 2279 (47) | 1.00 |
| Ex-smoker | 25 (5) | 198 (4) | 1.39 (0.90 to 2.17) |
| Current smoker | 137 (27) | 1065 (22) | 1.45 (1.15 to 1.83) |
| Missing | 140 (28) | 1331 (27) | 1.18 (0.91 to 1.52) |
| Maternal alcohol misuse | |||
| Never | 497 (98.81) | 4847 (99.47) | 1.00 |
| ≤1 year before poisoning | 2 (0.40) | 3 (0.06) | 6.07 (1.01 to 36.47) |
| >1 year before poisoning | 4 (0.80) | 23 (0.47) | 1.68 (0.58 to 4.86) |
| Social characteristics | |||
| Townsend index quintile | |||
| 1 (least deprived) | 89 (18) | 1057 (22) | 1.00 |
| 2 | 73 (15) | 895 (18) | 1.00 (0.71 to 1.39) |
| 3 | 102 (20) | 928 (19) | 1.40 (1.02 to 1.92) |
| 4 | 108 (21) | 920 (19) | 1.53 (1.11 to 2.11) |
| 5 (most deprived) | 102 (20) | 750 (15) | 1.87 (1.33 to 2.62) |
| Missing | 29 (6) | 323 (7) | 0.96 (0.49 to 1.90) |
| Single parenthood | |||
| Single adult | 226 (45) | 1964 (40) | 1.00 |
| Two adults | 241 (48) | 2531 (52) | 0.82 (0.67 to 1.00) |
| Other | 36 (7) | 378 (8) | 0.83 (0.56 to 1.21) |