Impact collaborative care score
Studies with a CCS of 2 showed in relation to the other scores the most interventions (k=14) with a positive effect on maternal mental health (see table 2). Interventions with higher scores did not show more often a positive effect than interventions with lower scores. Of the 24 interventions with a positive effect, 20 studies met the criterion of a multi-professional approach to patient care. The ranges of retention and compliance rates are also described in table 2. These do not show a clear pattern. However, all studies with the highest retention rates of> 90% (k=7) and studies with the highest compliance rates of > 60% (k=6) met the criterion of a multi-professional approach to patientcare. The few studies that scored on interprofessional communication had predominantly high retention and compliance rates. Altogether, although a higher CCS did not always show a positive effect or higher retention and compliance rates, almost all interventions with a positive effect on maternal mental health and with high retention and compliance rates met the criterion of a multi-professional approach to patient care.