“…The number of included women ranged from 382 [ 8 ] to 153,396 [ 6 ]. Nine studies used the WHO cut-off of 11 g/dL haemoglobin for the diagnosis of anaemia [ 8 , 9 , 10 , 19 , 20 , 21 , 22 , 23 , 25 , 26 , 27 ], while five studies adopted the CDC cut-off of <10.5 g/dL [ 6 , 22 , 23 , 24 , 28 ] ( Table S3 ). In over half of the studies (n = 9, 64.2%) [ 10 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 28 ], haemoglobin was measured in the third trimester or at delivery, while it was measured in the first trimester in four studies [ 6 , 8 , 9 , 24 ] and the second trimester [ 26 ] in one study.…”