GSTM1 and anemia (phenotype): Use of POC(Hb)Ts varied across included studies: to assess diagnostic accuracy (n=14, 34%), assess anaemia prevalence or associated factors/infections (n=13, 32%), assess Hb levels during intervention follow-up (n=6, 15%), assist triage of sick children (n=3, 7%), guide and monitor transfusion in children with severe anaemia (n=3, 7%), assess trial eligibility (n=1, 2%) and assess effect of anaemia on school performance (n=1, 2%).