Menon 1962.

Methods	This is a RCT conducted in Inida, in which women were allotted to each group in the order they were registered.
Participants	Pregnant women between 16 weeks and 24 weeks whose haemoglobin level was at or above 10.5 gm% (14.5 gm = 100%) (n = 273).
Interventions	Group 1 was given 5 g of ferrous sulphate (n = 88). Group 2 was given 5 mg of folic acid (n = 90). Group 3 was given 5 g of ferrous sulphate and 5 mg of folic acid (n = 90).
Outcomes	Fall in pre‐delivery haemoglobin level (n = 273).
Notes	All the women were given multivitamin along with these treatments. In this review we compared group 1 with group 3.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	Quote: "subjects were allotted to each group in the order in which they registered". Comment: probably not done.
Allocation concealment (selection bias)	Unclear risk	Insuffient information on allocation concealment.
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Insuffient information to make any judgment regarding blinding.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Exclusion data with their reasons were not reported in the study. Attrition (> 20%) along with the reasons were reported.
Selective reporting (reporting bias)	Low risk	Study seemed to be free from selective reporting.
Other bias	Unclear risk	No other bias identified but insufficient information available to fully assess this 'Risk of bias' domain.