Chapter 4 84 as “intended” pregnancies (even if a pregnancy was planned but considered unwanted at the pregnancy intake, as these pregnancies were planned at conception). In case of an uncertain pregnancy intention after assessment by the researcher, a second researcher was asked to independently assess the pregnancy intention. If consensus could be reached, the pregnancy was included in the cohort. If uncertainty remained, the pregnancy was excluded from the study. Figure 4.1 - Displays the inclusion process of the retrospective cohort. Demographic characteristics Maternal age at delivery was calculated through delivery date of the neonate and date of birth of the mother. Ethnical background was determined by country of birth of Obstetric dataset of deliveries between 01-01-2015 and 01-032020 and age ≥18 years n= 27.881 Exclusion: Any previous delivery of the same women n= 2.892 File not accessible as patient refused to participate in any chart research n=0 Exclusion: All files without data on pregnancy intention n= 10.013 Exclusion: - Missing pregnancy intention n=864 - Missing psychiatric history n= 69 - Delivery other than singleton (twin or wrong registration of delivery) n=111 - Intellectual disability n=4 Study group with history of or present psychiatric diagnose n= 1.219 Reference group without history of or present psychiatric diagnose n= 1.093 n= 965 n= 128 n= 904 n= 315 Exclusion: - Missing pregnancy intention n= 284 - Missing psychiatric history n= 20 - Delivery other than singleton (twin or wrong registration of delivery) n=90 - Intellectual disability n=22 n= 416 n= 1.048 Random selection of records not cleaned n=11.192 Individual women with their most recent delivery n= 24.989 Women with data on pregnancy intention in files n= 14.976 Visit to obstetric outpatient clinic n= 13.520 Visit to perinatal psychiatry outpatient clinic n= 1.448 Selection of all records to clean n= 1.448 Random selection of records to clean to create reference group n= 2.328
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