From: Sudden infant death syndrome: a re-examination of temporal trends
Plurality and gestational age (weeks) | Traditional approach | Fetuses-at-risk approach | ||||||
---|---|---|---|---|---|---|---|---|
1995-96 | 2004-05 | 2004-05 vs 1995-96 | 1995-96 | 2004-05 | 2004-05 vs 1995-96 | |||
SIDS rate (per 10,000 live births) | SIDS rate (per 10,000 live births) | Rate difference | Rate ratio (95% CI) | SIDS rate (per 10,000 FAR) | SIDS rate (per 10,000 FAR) | Rate difference | Rate ratio (95% CI) | |
Singletons | ||||||||
22-36 weeks | 20.34 | 12.31 | −8.0 | 0.61 (0.60-0.61) | 1.52 | 1.08 | −0.4 | 0.71 (0.71-0.71) |
≥37 weeks | 7.32 | 4.93 | −2.4 | 0.67 (0.67-0.67) | 6.74 | 4.48 | −2.3 | 0.67 (0.67-0.67) |
Total | 8.30 | 5.58 | −2.7 | 0.67 (0.67-0.67) | 8.26 | 5.56 | −2.7 | 0.67 (0.67-0.67) |
Twins | ||||||||
22-36 weeks | 17.65 | 12.27 | −5.4 | 0.70 (0.69-0.70) | 9.35 | 7.59 | −1.8 | 0.81 (0.81-0.82) |
≥37 weeks | 10.34 | 7.96 | −2.4 | 0.77 (0.76-0.78) | 10.32 | 7.95 | −2.3 | 0.77 (0.76-0.78) |
Total | 14.25 | 10.64 | −3.6 | 0.75 (0.74-0.75) | 14.12 | 10.58 | −3.5 | 0.75 (0.74-0.75) |