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

1

Only includes data from low risk women antenatally who have normal vaginal births

2

Includes data from women who are low risk antenatally and who have less than 10% operative births

3

Includes women who are low risk antenatally but who have 10% or more operative births

4

Includes data from unselected antenatal women where all births are included irrespective of rate of operative birth

5

Includes data from unselected antenatal women, all of whom have operative births.