Table 1 Progression criteria to full trial

Recruitment—numbers of available women in each catchment

Within each catchment area, 60+ pregnant women with appropriate due dates

Within each catchment area, 40–59 pregnant women with appropriate due dates

Within the catchment area, less than 40 pregnant women with appropriate due dates

Recruitment—percentage who consent to randomisation

More than 40% who are eligible consent to randomisation

20–40% who are eligible consent to randomisation

Less than 20% who are eligible agree to randomisation

Uptake of group care model

8 or more of the 12 randomised take up the groups

6–7 of the 12 randomised take up the group

Fewer than 6 of the 12 randomised take up the group

Retention in groups*

5 remain in the group for 6+ sessions

4–5 remain in the group for 6+ sessions

Fewer than 4 women remain in the group for 6+ sessions

Follow-up response rate—self-complete outcomes questionnaire(s)

75% or greater response to follow-up

40–74% response to follow-up

Less than 40% response to follow-up