From: Reduced prevalence of placental malaria in primiparae with blood group O
 | Blood group, primiparae | Blood group, multiparae | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
 | O | Non-O | O | Non-O | ||||||
 |  | All | B | A | AB |  | All | B | A | AB |
No. | 174 | 126 | 72 | 46 | 8 | 283 | 237 | 111 | 102 | 24 |
P. falciparum infection, placental blood (%) | Â | Â | Â | Â | Â | Â | Â | Â | ||
 Microscopy positive | 42.5 | 50.0 | 52.8 | 43.5 | 62.5 | 30.0 | 27.0 | 31.5 | 21.6 | 29.2 |
 Haemozoin positive | 36.2 | 50.8* | 52.8* | 50.0 | 37.5 | 24.0 | 24.9 | 28.8 | 17.6 | 37.5 |
 PCR positive | 60.3 | 70.6 | 65.3 | 76.1* | 87.5 | 55.5 | 58.2 | 60.4 | 54.9 | 62.5 |
 Any positive finding†| 61.5 | 76.2* | 69.4 | 84.8* | 87.5 | 57.6 | 61.6 | 64.0 | 57.8 | 66.7 |
P. falciparum infection, peripheral blood (%) | Â | Â | Â | Â | Â | Â | Â | Â | ||
 Microscopy positive | 24.1 | 29.4 | 33.3 | 26.1 | 12.5 | 17.0 | 11.4 | 14.4 | 8.8* | 8.3 |
 PCR positive | 54.6 | 65.1 | 62.5 | 69.6 | 62.5 | 50.5 | 49.4 | 52.3 | 45.1 | 54.2 |