Table 3 Crude estimates of risks (RR and 95%CI) for neonatal outcomes according to birth weight
From: Perinatal outcomes associated with low birth weight in a historical cohort
Outcomes | Low birth weight n (%) | Normal birth weight n (%) | RR (95%CI) |
|---|---|---|---|
1 st min Apgar score | Â | Â | Â |
   7-10 | 4,529 (70.0) | 33,476 (89.3) | 1.00 |
   <7 | 1,681 (25.9) | 3,263 (8.7) | 3.05 (2.89-3.21) |
   Unknown | 267 (4.1) | 728 (1.9) |  |
5 th min Apgar score | Â | Â | Â |
   7-10 | 5,721 (88.3) | 36,333 (97.0) | 1.00 |
   <7 | 510 (7.9) | 440 (1.2) | 6.84 (6.04-7.75) |
   Unknown | 246 (3.8) | 694 (1.8) |  |
Somatic gestational age | Â | Â | Â |
   ≥37 weeks | 2,416 (37.3) | 31,971 (85.3) | 1.00 |
   <37 weeks | 2,911 (45.0) | 1,030 (2.7) | 17.51 (16.41-18.68) |
   Unknown | 1,150 (17.7) | 4,466 (11.9) |  |
Sex | Â | Â | Â |
   Male | 2,829 (43.7) | 17,908 (47.8) | 1.00 |
   Female | 3,009 (46.4) | 16,691 (44.5) | 1.07 (1.04-1.10) |
   Unknown | 639 (9.9) | 2,868 (7.7) |  |
Malformation | Â | Â | Â |
   Without | 4,984 (76.9) | 31,967 (85.3) | 1.00 |
   With | 291 (4.5) | 580 (1.5) | 3.10 (2.70-3.55) |
   Unknown | 1,202 (18.6) | 4,920 (13.1) |  |
Total | 6,477 (100.0) | 37,467 (100.0) | Â |