- Design
- Randomised controlled trial, non-blinded
- Population
- 350 pregnant women in Japan, no minimum depression score
- Primary outcome
- Change in PHQ-9 from baseline to 8 weeks
- Effect
- No significant difference (SMD 0.11); SMD 0.28 favouring the app at 1 month postpartum
A Japanese trial randomised 350 pregnant women, recruited nationally online and with no minimum depression score, to a fully self-guided smartphone app based on interpersonal psychotherapy or usual care.
Nine in ten app users rated it satisfactory. Depressive symptoms on the PHQ-9 at eight weeks — the main efficacy measure — did not differ. At one month postpartum, the app group's symptom scores were lower, with a small standardised difference of 0.28.
This is a universal, low-intensity approach rather than treatment for diagnosed depression. The postpartum effect was a secondary time point and the trial was unblinded, so it should be treated as encouraging rather than settled. It does not replace screening and referral pathways for perinatal depression.
- Keep standard screening for perinatal depression in pregnancy and postpartum; a self-help app is not a substitute.
- Consider an interpersonal-therapy-based self-help programme as an add-on for women with mild symptoms or long waits for therapy.
- Recheck mood at the early postpartum review, when this trial saw its only difference.
- Refer women with moderate or severe symptoms, or any thoughts of self-harm, for specialist assessment as usual.
Why it matters
Low-intensity support that reaches every pregnant woman may matter most in the weeks after delivery, when contact with services falls away.
Don't overread it
The primary measure at eight weeks showed no difference; the postpartum effect was a secondary time point in an unblinded trial.
The statistics, in plain English
A standardised mean difference of 0.28 is conventionally a small effect — noticeable across a population, but modest for any one woman. The antenatal difference of 0.11 was not statistically significant.
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