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Table 1 PECO framework for eligibility of research question

From: The prevalence, risk factors and outcomes of anaemia in South African pregnant women: a protocol for a systematic review and meta-analysis

Population Pregnant women with anaemia in South Africa
Intervention/exposure Haemoglobin concentration < 10 g/dL
Comparator Pregnant women without anaemia in any trimester
Outcomes Prevalence, severity, risk factors, maternal morbidity and mortality, fetal outcomes