Numbers of infants studied and responses elicited to both test and sham stimuli at each study for each sleep state and sleep position for non-smoking and smoking groups
| Smoking group | Non-smoking group | |||||||
|---|---|---|---|---|---|---|---|---|
| AS | QS | AS | QS | |||||
| Age at study | Prone | Supine | Prone | Supine | Prone | Supine | Prone | Supine |
| *p<0.05; **p<0.01; *** p<0.001 prone v supine. | ||||||||
| †p<0.05; ††p<0.01; †††p<0.001 AS v QS. | ||||||||
| ‡p<0.05; ‡‡p<0.01; ‡‡‡p<0.001 non-smoking v smoking groups. | ||||||||
| AS, Active sleep; QS, quiet sleep. | ||||||||
| 2–3 weeks | ||||||||
| Number of infants | 11 | 11 | 11 | 11 | 13 | 13 | 13 | 13 |
| Total stimulus presentations | 389 | 315 | 263 | 176 | 382 | 345 | 269 | 207 |
| Arousal threshold (cm H2O) | 208 (31) | 157 (21) | 275 (41) | 212 (33) | 264 (30) | 175 (21) | 347 (52)* | 246 (31) |
| % spontaneous arousal | 4 | 7†† | 2 | 1 | 2* | 8†† | 1 | 1 |
| 2–3 months | ||||||||
| Number of infants | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| Total stimulus presentations | 317 | 249 | 303 | 250 | 256 | 162 | 277 | 166 |
| Arousal threshold (cm H2O) | 154 (23)†††‡‡ | 106 (15)††† | 409 (57) | 380 (72)‡ | 257 (40)†††** | 106 (18) | 457 (66)*** | 181 (32) |
| % spontaneous arousal | 4††† | 5††† | 0 | 0 | 5 | 8 | 2‡ | 5‡‡‡ |
| 5–6 months | ||||||||
| Number of infants | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 |
| Total stimulus presentations | 77 | 52 | 238 | 158 | 124 | 48 | 185 | 128 |
| Arousal threshold (cm H2O) | 265 (99)† | 122 (29)†† | 603 (91) | 513 (111) | 163 (33)††† | 156 (42)††† | 624 (91) | 560 (116) |
| % spontaneous arousal | 3 | 8†† | 0 | 1 | 7†† | 11 | 1 | 3 |