Table 1 Target figures

120 randomised to intervention → 84 women are contactable]

80% of women were contactable for the BiBBS postnatal sweep, which takes place approximately 12 weeks after recruitment into BiBBS. We will contact women 1–3 years after recruitment into BiBBS, and so we have set our rate to be lower at 70%.

84 women contacted → 44 women consent to the referral → 22 women enrol

On average, the rate of conversion from referral to enrolee in IY-T is 52%. We therefore anticipate that 52% of randomised BiBBs participants will agree to be referred, and 50% of those referred will enrol into the programme.

22 enrolees → 20 enrolees go on to participate

On average, 89% of enrolees to IY-T are converted into participants. We have set a target of 90% of randomised enrolees to be converted into participants.

20 participants → 12 participants go on to complete

60% of participants go on to complete IY-T. We have set our rate to be 60%.