Odds ratios and 95% confidence intervals for alcohol and cannabis use for night and daytime periods
| Night | Day | ||||||
|---|---|---|---|---|---|---|---|
| Cases | Controls | Odds ratio† (95% CI) | Cases | Controls | Odds ratio† (95% CI) | p* | |
| *p value for interaction effect. | |||||||
| †Adjusted for confounding factors: (a) demographic factors: socioeconomic status (occupation), marital status, school leaving age, mother’s age at birth of infant; (b) pregnancy factors: antenatal class attended, months pregnancy when mother started attending antenatal classes, number of previous pregnancies, mother’s age at first pregnancy; (c) infant factors: sex of baby, ethnicity, birth weight, gestation; and (d) postnatal factors: region, baby’s age time of death/nominated time, season, sleeping position, maternal smoking, breast feeding, infant sharing bed with another person. | |||||||
| Alcohol use in past month | |||||||
| No | 103 (43.3) | 338 (41.1) | 1.00 | 53 (40.5) | 295 (40.1) | 1.00 | 0.79 |
| Yes | 135 (56.7) | 484 (58.9) | 0.86 (0.59 to 1.25) | 78 (59.5) | 441 (59.9) | 0.93 (0.59 to 1.46) | |
| Binge drinking (number of glasses) | |||||||
| No | 86 (36.1) | 273 (33.2) | 1.00 | 46 (35.1) | 236 (32.1) | 1.00 | 0.052 |
| 1–7 | 98 (41.2) | 476 (57.9) | 0.78 (0.52 to 1.17) | 64 (48.9) | 431 (58.6) | 0.98 (0.60 to 1.60) | |
| 8 or more | 54 (22.7) | 73 (8.9) | 1.64 (0.94 to 2.86) | 21 (16.0) | 69 (9.4) | 0.84 (0.42 to 1.68) | |
| Cannabis use since birth of baby | |||||||
| No | 185 (77.7) | 772 (94.2) | 1.00 | 112 (85.5) | 673 (91.6) | 1.00 | 0.003 |
| Yes | 53 (22.3) | 48 (5.9) | 2.35 (1.36 to 4.05) | 19 (14.5) | 62 (8.4) | 0.64 (0.32 to 1.29) | |