| No. of pregnancies | Trials | number of trials |
| All women | Morley 1964 NGA; Nahlen 1989 NGA; Cot 1992 BFA; Nosten 1994 THA; Greenwood 1989 GMB; Villegas 2007 THA; Menendez 2008 MOZ; Ndyomugyenyi 2011 UGA; | 8 |
| First pregnancy | Fleming 1986 NGA; Menendez 1994 GMB; Cot 1995 CMR; Shulman 1999 KEN; Ndyomugyenyi 2000 UGA; Challis 2004 MOZ | 6 |
| First or second pregnancy | Parise 1998i KEN; Njagi 2003ii KEN | 2 |
| Only multiparous women | Mbaye 2006 GMB | 1 |
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