Fig. 4: Standardized incidence rate and incidence rate ratio of any psychiatric disorder, and depression, stratified on year of delivery.

The incidence rate was standardized by age and calendar year at delivery. The incidence rate ratio was estimated by every 5 weeks and adjusted for age and calendar year at delivery, week at follow-up, country of birth, region of residence, educational level, season at follow-up, civil status, smoking, BMI category, multiple gestation, hypertensive disease, diabetes, and parity.