Covariates
The primary and secondary outcomes may be a priori confounded by other factors, like gender because of higher birth weights in male infants compared to female infants. Maternal age at the time of conception, BMI before pregnancy, educational level (low/middle/high), presence of support system (defined as an in-house living partner) and smoking, drugs, and alcohol use during pregnancy, may be associated with birth weight and complications during delivery. The number and type of actual and historical mental disorders mentioned in the patient file and the use of concomitant other psychotropic drugs during pregnancy may affect primary and secondary outcomes, and so were recorded. Other possible confounders may be chronic comorbid disorders, such as thyroid disease and asthma, and pregnancy-related disorders, like (gestational) diabetes, hypertension, pre-eclampsia/HELLP, and infections during pregnancy. Further, information about the parity (0/1+), a previous miscarriage/abortion, and the use of IVF/ICSI were collected. The use of epidural/spinal anesthesia during delivery, position during delivery, gender of the newborn, and presence of meconium may influence the primary and secondary outcomes, and were also recorded.