Odds ratios and 95% confidence intervals for illness and symptom risk factors 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, socio-economic status (occupation), marital status, school leaving age, mother’s age at birth of infant; (b) pregnancy factors, ante natal class attended, months pregnancy when mother started attending ante natal classes, number of previous pregnancies, mother’s age at first pregnancy; (c) infant factors, sex of baby, ethnicity, birth weight and gestation; and (d) postnatal factors: region, baby’s age time of death/nominated time, season, sleeping position, maternal smoking, breast feeding, and infant sharing bed with another person. | |||||||
| ‡Odds ratio for trend. | |||||||
| Illness | |||||||
| No symptoms | 160 (76.2) | 709 t(90.6) | 2.06‡ (1.40 to 3.02) | 97 (82.2) | 602 (85.9) | 1.10‡ (0.68 to 1.75) | 0.036 |
| 1–3 | 35 (16.7) | 57 (7.3) | 15 (12.7) | 81 (11.6) | |||
| More than 3 | 15 (7.1) | 17 (2.2) | 6 (5.1) | 18 (2.6) | |||
| Sweating | |||||||
| Never | 166 (70.0) | 698 (85.2) | 1.67‡ (1.28 to 2.20) | 94 (72.3) | 609 (82.9) | 1.08‡ (0.76 to 1.55) | 0.052 |
| 1–2 only | 28 (11.8) | 77 (9.4) | 23 (17.7) | 81 (11.0) | |||
| At least weekly | 43 (18.1) | 44 (5.4) | 13 (10.0) | 45 (6.1) | |||
| Baby awake in past two days | |||||||
| More | 76 (32.3) | 224 (27.5) | 1.73 (1.15 to 2.60) | 33 (25.4) | 212 (29.1) | 0.59 (0.35 to 0.98) | |
| Same | 130 (55.3) | 548 (67.2) | 1.00 | 86 (66.2) | 468 (64.2) | 1.00 | 0.004 |
| Less | 29 (12.3) | 44 (5.4) | 2.64 (1.33 to 5.23) | 11 (8.5) | 49 (6.7) | 1.28 (0.56 to 2.90) | |
| Baby difficult to settle in past two days | |||||||
| More | 78 (33.0) | 207 (25.3) | 1.52 (1.01 to 2.27) | 25 (19.2) | 160 (21.8) | 0.78 (0.45 to 1.36) | |
| Same | 137 (58.1) | 569 (69.7) | 1.00 | 98 (75.4) | 524 (71.5) | 1.00 | 0.014 |
| Less | 21 (8.9) | 41 (5.0) | 2.64 (1.25 to 5.56) | 7 (5.4) | 49 (6.7) | 0.58 (0.22 to 1.50) | |