Prevalence of risk factors among all co-sleeping and non co-sleeping infants during the last sleep period
| Variable | Co-sleepers (%) | Sleeping alone (%) | χ2 | p value |
|---|---|---|---|---|
| Percentages refer to proportion of all subjects, including both cases and controls. | ||||
| Placed prone | 8 | 4 | 3.54 | 0.06 |
| Found prone | 14 | 9 | 3.42 | 0.06 |
| Pillows used | 54 | 13 | 94.63 | <0.001 |
| Tog of bedding ⩾10 | 81 | 50 | 33.31 | <0.001 |
| Duvets used | 79 | 18 | 166.16 | <0.001 |
| Absence of routine soother use | 36 | 23 | 7.83 | <0.01 |
| Mother smoker | 65 | 32 | 40.46 | <0.001 |
| Breast feeding initiated at birth | 39 | 42 | 0.33 | 0.56 |
| Illness in last 48 h | 39 | 28 | 21.76 | <0.05 |
| History of illness since birth | 56 | 32 | 5.77 | <0.001 |
| Social disadvantage (3–5) | 43 | 18 | 35.31 | <0.001 |