Abstract
Postnatal depression (PND) disrupts the crucial mother-infant relationship on which optimal child development depends. However, few well-evaluated, brief mother-infant interaction interventions exist. This randomised controlled trial (RCT) aimed to evaluate the effect of a 4-session, group-based mother-infant interaction intervention ('HUGS'), compared to a control playgroup, both following cognitive-behavioural therapy for PND, on mother-infant relationships and early child development. It was hypothesised that dyads receiving the HUGS intervention would show larger improvements than control dyads. Mothers (n = 77; M age = 32years) diagnosed with major or minor depressive disorder using the Structured Clinical Interview for the DSM-IV participated with their infants (<12months). Primary outcomes were observed mother-infant interactions using the Parent Child Early Relational Assessment (ERA) and maternal parenting stress using the Parenting Stress Index (PSI). Data were collected at baseline, post-PND treatment, post-HUGS intervention and 6-month post-HUGS follow-up. Seventy-four percent of HUGS dyads attended at least half of the HUGS sessions (≥2). Significant group differences emerged at the 6-month follow-up (but were not significant immediately post-HUGS). At 6-month follow-up, HUGS dyads showed significantly improved parental positive affective involvement and verbalisation (ERA; F1, 47 = 4.96, p = .03, ηp2 = .10) and less impaired bonding (F1, 45 = 4.55, p = .04, ηp2 = .09) than control dyads. No differences were found on the PSI or on child development outcomes. Both groups improved substantially (around 30 points) on the PSI following PND treatment, so that average scores were below the clinically significant threshold when beginning HUGS and the control playgroup. Findings suggest that incorporating HUGS intervention following PND treatment is effective for improving mother-infant relationships. A longer-term follow-up and larger sample size may be needed for improved mother-infant relationships to show an impact on observable child developmental outcomes. Registered with the Australian New Zealand Clinical Trials Registry (ACTRN12612001110875).
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