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Table 2 Grading system for trials of intervention for PPH prophylaxis, based on participant inclusion criteria

From: Postpartum haemorrhage (PPH) rates in randomized trials of PPH prophylactic interventions and the effect of underlying participant PPH risk: a meta-analysis

GradeDefinition
1Only includes data from low risk women antenatally who have normal vaginal births
2Includes data from women who are low risk antenatally and who have less than 10% operative births
3Includes women who are low risk antenatally but who have 10% or more operative births
4Includes data from unselected antenatal women where all births are included irrespective of rate of operative birth
5Includes data from unselected antenatal women, all of whom have operative births.