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randomised placebo-controlled trial.
blinded (patients and healthcare providers).*
6 prenatal clinics in Iran.
750 non-smoking women 17–35 years of age (mean age 26 y) with a singleton pregnancy in the early second trimester (mean 13 wks), haemoglobin concentration ⩾13.2 (mean 14.0) g/dl, body mass index 19.8–26 kg/m2, no history of threatened abortion in the current pregnancy, and no disease related to polycythaemia such as asthma or chronic hypertension.
ferrous sulphate, 150 mg (50 mg of elemental iron) (n = 375), or placebo (n = 375) once daily throughout pregnancy. All women received folic acid, 1 mg/day, but were not allowed to take other vitamin or mineral supplements.
small for gestational age (SGA, <10th percentile) infant, hypertensive …