Data collection process and data items
Reviewers independently (Xiajing Chu, Jingwen Li) extracted data using a
standardized form. The following
data was extracted: (1)general information, including first author,
country, setting, baseline characteristics of the participants; (2)birth
outcomes, including prematurity (<37 GA), low birth weight (a
birthweight of a live infant weighing <2,500 g), small for
gestational age and overall mortality (stillbirth and spontaneous
abortion); (3)maternal outcomes: anemia during pregnancy (haemoglobin
<110 g/L), placental malaria by histology and infection with
malaria parasites at delivery; (4)adverse effects, such as abdominal
pain, cough, diarrhea, chills, headache, malaise.