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Table 1 ABO phenotype by placental malaria category and parity group

From: ABO phenotypes and malaria related outcomes in mothers and babies in The Gambia: a role for histo-blood groups in placental malaria?

Parity Placental malaria Phenotype N (%) OR 95% CI O/non O
  Type No A B AB O  
Primiparae Active 41 6 (37) 6 (30) 0 (0) 29 (58) 2.99, 1.24–7.25
  Past 15 4 (25) 4 (20) 2 (100) 5 (10) 0.3, 0.1–1.0
  None 33 6 (37) 10 (50) 0 (0) 16 (32) 0.65, 0.27–1.55
  Total 88 16 20 2 50  
Multiparae Active 33 6 (27) 11 (29) 2 (50) 14 (27) 0.75, 0.33–1.7
  Past 27 8 (36) 10 (31) 0 (0) 9 (17) 0.47, 0.19–1.15
  None 50 8 (36) 11 (34) 2 (50) 29 (56) 2.22, 1.03–4.78
  Total 110 22 32 4 52  
  1. Brackets: percentage
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