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Jonathan Evans a Division of Psychiatry,
University of Bristol, Bristol BS2 8DZ, b Unit of Paediatric and
Perinatal Epidemiology, Division of Child Health, University of
Bristol, Bristol BS8 1TQ, c Department of Women's Health and Care of the Newborn, North
Bristol NHS Trust, Southmead Hospital, Westbury-on-Trym, Bristol BS10
5NB, d Mother and Baby
Unit, Barrow Hospital, Barrow Gurney, Bristol BS48 3SG
Correspondence
to: J Evans j.evans{at}bristol.ac.uk
Objective:
To follow mothers' mood through
pregnancy and after childbirth and compare reported symptoms of
depression at each stage.
Design:
Longitudinal cohort study.
Setting:
Avon.
Participants:
Pregnant women resident within Avon
with an expected date of delivery between 1 April 1991 and 31 December 1992.
Main outcome measures:
Symptom scores from the
Edinburgh postnatal depression scale at 18 and 32 weeks of pregnancy
and 8 weeks and 8 months postpartum. Proportion of women above a
threshold indicating probable depressive disorder.
Results:
Depression scores were higher at 32 weeks of pregnancy than 8 weeks postpartum (difference in means 0.88, 95% confidence interval 0.79 to 0.97). There was no difference in the
distribution of total scores or scores for individual items at the four
time points. 1222 (13.5%) women scored above threshold for probable
depression at 32 weeks of pregnancy, 821 (9.1%) at 8 weeks postpartum,
and 147 (1.6%) throughout. More mothers moved above the threshold for
depression between 18 weeks and 32 weeks of pregnancy than between 32 weeks of pregnancy and 8 weeks postpartum.
Conclusions:
Symptoms of depression are not more
common or severe after childbirth than during pregnancy. Research and clinical efforts need to be moved towards understanding, recognising, and treating antenatal depression.
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