ARE SYMPTOM FEATURES OF DEPRESSION DURING PREGNANCY, THE POSTPARTUM PERIOD AND OUTSIDE THE PERIPARTUM PERIOD DISTINCT? RESULTS FROM A NATIONALLY REPRESENTATIVE SAMPLE USING ITEM RESPONSE THEORY (IRT)
ARE SYMPTOM FEATURES OF DEPRESSION DURINGPREGNANCY, THE POSTPARTUM PERIOD ANDOUTSIDE THE PERIPARTUM PERIOD DISTINCT?RESULTS FROM A NATIONALLY REPRESENTATIVESAMPLE USING ITEM RESPONSE THEORY (IRT)