The health visitors will recruit the families during their first visit after birth. Health visitors have been instructed to inform about the project verbally and in writing in families where the mother meets the eligibility criteria (see information sheet in Appendix A). Enrolment is done by the health visitors who collect families’ consent and help fill in the families’ information in a secure electronic recruitment form. Furthermore, the health visitor assesses whether the mothers qualify for the intensified intervention based on her age and educational level. Participation in the survey and the intensified intervention are independent, i.e., mothers declining participation in the survey may still accept the intensified intervention.
Municipalities will stop recruiting when the required number of mothers with data from the first three questionnaires has been reached, as outlined in the description of the sample size calculation.
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