Table 3 Number of articles with significant improvement of mental health-related outcomes according to the timeframe for inclusion and intervention

Timeframe for inclusion in the study

 Pregnancy (n = 24)

13 (54.1)

[20, 36, 37, 39, 45, 56, 60, 65, 67, 69, 73, 74, 77]

 Postpartum period (n = 20)

15 (75.0)

[41, 46, 51, 52, 54, 57,58,59, 61,62,63, 66, 70, 71, 75]

Timeframe for intervention

 Pregnancy (n = 14)

9 (64.3)

[20, 36, 39, 45, 56, 60, 65, 69, 73]

 Postpartum period (n = 20)

15 (75.0)

[39, 41, 46, 51, 52, 54, 57,58,59, 61,62,63, 66, 71, 75]

 Both pregnancy and postpartum (n = 10)

4 (40.0)

[37, 67, 74, 77]