Abstract: We included 48 studies that involved 4937 participants and covered three types of programme: behavioural, cognitive-behavioural and multimodal. Overall, we found that group-based parenting programmes led to statistically significant short-term improvements in depression (standardised mean difference (SMD) -0.17, 95% confidence interval (CI) -0.28 to -0.07), anxiety (SMD -0.22, 95% CI -0.43 to -0.01), stress (SMD -0.29, 95% CI -0.42 to -0.15), anger (SMD -0.60, 95% CI -1.00 to -0.20), guilt (SMD -0.79, 95% CI -1.18 to -0.41), confidence (SMD -0.34, 95% CI -0.51 to -0.17) and satisfaction with the partner relationship (SMD -0.28, 95% CI -0.47 to -0.09). However, only stress and confidence continued to be statistically significant at six month follow-up, and none were significant at one year. There was no evidence of any effect on self-esteem (SMD -0.01, 95% CI -0.45 to 0.42). None of the trials reported on aggression or adverse effects. The limited data that explicitly focused on outcomes for fathers showed a statistically significant short-term improvement in paternal stress (SMD -0.43, 95% CI -0.79 to -0.06). We were unable to combine data for other outcomes and individual study results were inconclusive in terms of any effect on depressive symptoms, confidence or partner satisfaction. The findings of this review support the use of parenting programmes to improve the short-term psychosocial wellbeing of parents. Further input may be required to ensure that these results are maintained. More research is needed that explicitly addresses the benefits for fathers, and that examines the comparative effectiveness of different types of programme along with the mechanisms by which such programmes bring about improvements in parental psychosocial functioning.

Plain-language summary: We included a total of 48 studies that involved 4937 participants and covered three types of programme: behavioural, cognitive-behavioural and multimodal. Overall, the results suggested statistically significant improvements in the short-term for parental depression, anxiety, stress, anger, guilt, confidence and satisfaction with the partner relationship. However, only stress and confidence continued to be statistically significant at six month follow-up, and none were significant at one year. There was no evidence of effectiveness for self-esteem at any time point. None of the studies reported aggression or adverse outcomes. Only four studies reported the outcomes for fathers separately. These limited data showed a statistically significant short-term improvement in paternal stress but did not show whether the parenting programmes were helpful in terms of improving depressive symptoms, confidence or partner satisfaction. This review shows evidence of the short-term benefits of parenting programmes on depression, anxiety, stress, anger, guilt, confidence and satisfaction with the partner relationship. The findings suggest that further input may be needed to support parents to maintain these benefits. However, more research is needed that explicitly addresses the benefits for fathers, and that provides evidence of the comparative effectiveness of different types of programme and identifies the mechanisms involved in bringing about change.