Baseline information
| Subgroup (1) | Subgroup (2) | Subgroup (3) | Subgroup 4 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| From birth to last observation | From birth to last observation within 2 wk of death/interview | From birth to last two observations1-150 before death/interview | From birth to observation at 6 wk (using 5–7 wk window) | ||||||||
| SIDS | Controls | SIDS | Controls | SIDS | Controls | SIDS | Controls | ||||
| Baseline information | n | % | n | % | n | % | n | % | |||
| Number of infants (%) | 247 (76.0) | 1110 (85.4) | 119 (36.6) | 531 (40.8) | 73 (22.5) | 320 (24.6) | 170 (52.3) | 861 (66.2) | |||
| z score at birth1-151 | −0.19 (1.05) | +0.07 (0.99) | −0.22 (1.07) | +0.03 (0.98) | −0.30 (1.09) | +0.05 (0.98) | −0.23 (1.08) | +0.07 (0.98) | |||
| Equivalent centile | 42nd | 53rd | 41st | 51st | 38th | 52nd | 41st | 53rd | |||
| Median number of observations per infant1-152 | 4.2 (2.0–7.8) | 5.1 (3.1–8.1) | 5.9 (2.7–7.9) | 5.9 (3.9–8.8) | 7.2 (5.6–10.4) | 7.9 (5.6–10.9) | 6.3 (4.4–8.8) | 6.5 (4.5–9.3) | |||
| Median number of days: birth to obs 11-152 | 80 (55–118) | 85 (55–130) | 79 (58–110) | 83 (57–121) | 56 (40–80) | 68 (48–100) | 42 (40–44) | 42 (40–44) | |||
| Median number of days: obs 1 to obs 21-152 | — | — | — | — | 30 (28–35) | 34 (28–41) | — | — | |||
| Median number of days: obs 1/2 to death/interview1-152 | 15 (6–34) | 15 (6–35) | 6 (2–10) | 6 (3–10) | 6 (2–9) | 6 (2–10) | 62 (29–119) | 70 (34–127) | |||