Table 2.

Characteristics of studies investigating hookworm and maternal anemia during pregnancy

Study	Location	Study type	Population	Anemia definition	Anemia prevalence (%)
Agu27	Nigeria	Cross-sectional	226 pregnant women	Hb < 10 g/dL	40
Aikawa28	Vietnam	Cross-sectional	886 pregnant women (666 with stool available)	Hb < 10 g/dL	13
Baingana36	Uganda	Cross-sectional	151 pregnant women	Hb < 11 g/dL	28
Bolka38	Ethiopia	Cross-sectional	352 pregnant women	Hb < 11 g/dL	31
Ebuy29	Ethiopia	Unmatched case–control	164 pregnant women (88 cases and 176 controls)	Hb < 7 g/dL cases, 11–15.5 g/dL controls	NA
Feleke41	Ethiopia	Cross-sectional	550 pregnant women	Hb < 11 g/dL	34
Fuseini25	Ghana	Cross-sectional	300 pregnant women	Hb < 11 g/dL	64
Getachew42	Ethiopia	Cross-sectional	388 pregnant women	Hct < 33%*	54
Gyorkos44	Peru	Prospective cohort	1,042 pregnant women	Hb < 11 g/dL	31
Hailu45	Ethiopia	Cross-sectional	743 pregnant women	Hb < 11 g/dL	11
Kumera47	Ethiopia	Cross-sectional	234 pregnant women	Hb < 11 g/dL	47
Lebso48	Ethiopia	Cross-sectional	507 pregnant women	Hb < 11 g/dL	17
Lindstrom30	Bangladesh	Cross-sectional	740 pregnant women	Not stated	27
Mahande31	Tanzania	Cross-sectional	6,533 pregnant women	Not stated	2
Makhoul32	Nepal	Cross-sectional	3,003 pregnant women	Hb < 8 g/dL	4
Melku49	Ethiopia	Cross-sectional	302 pregnant women	Hb < 11 g/dL in first and third trimester Hb < 10.5 g/dL second trimester	17
Mengist50	Ethiopia	Cross-sectional	372 pregnant women	Hb < 11 g/dL	17
Mutuku26	Kenya	Prospective cohort	378 pregnant women	Hb < 11 g/dL	72
Ndyomugyenyi33	Uganda	Cross-sectional	832 pregnant women	Hb < 100 g/L (10 g/dL)	21
Phuanukoonnon52	Papua New Guinea	Cross-sectional	201 pregnant women	Hb < 11 g/dL	7
Tay34	Ghana	Cross-sectional	375 pregnant women	Not stated	66
Thi Tran53	Vietnam	Cross-sectional	216 pregnant women	Hb < 11 mg/mL	8
van Eijk55	Kenya	Cross-sectional	390 pregnant women	Hb < 11 g/dL	52

NA = not applicable.

^*Per WHO, Hct < 33% is equal to Hb < 11 g/dL.