Table 1 Mortality among study area children born between September 2009 and August 2011
From: A prospective study of twinning and perinatal mortality in urban Guinea-Bissau
| Â | Twins1 | Singletons1 | RR (CI) |
|---|---|---|---|
Perinatal death | 41/188 (218/1000) | 413/5134 (80/1000) | RR = 2.71 (1.93-3.80) |
Perinatal death by sex* | Â | Â | Â |
  Male | 24/102 (235/1000) | 217/2624 (83/1000) | RR = 2.85 (1.91-4.23) |
  Female | 17/86 (198/1000) | 196/2509 (78/1000) | RR = 2.53 (1.54-4.14) |
Perinatal death by birth weight** | Â | Â | Â |
  Birth weight ≥ 2500g | 4/49 (82/1000) | 126/2934 (43/1000) | RR = 1.90 (0.77-4.71) |
  Birth weight < 2500g | 18/93 (194/1000) | 74/342 (216/1000) | RR = 0.89 (0.51-1.56) |