Figure 1

Participant selection. A participant was considered to have indicated interest if they answered, ‘yes’ or ‘unsure’ to the question: ‘At the present time, do you wish to have any/any more biological children in the future?’ *Of these 10, six selected ‘yes/unsure’ on the Y1 and ‘no’ on the baseline, and four selected ‘yes/unsure’ on the Y1 and left this question blank on the baseline.