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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    
   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    
   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    
   ≥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    
   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    
   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)