Background characteristics and distress measures according to preterm birth.

*mean gestational age for filling out questionnaire 2 was 30 weeks, SD 2 weeks. However, some women filled out the form before 30 weeks' gestation while some gave birth after week 30 (in week 31). As a result, approximately 40% of those giving birth early preterm filled out questionnaire 2 and the SCL-5 a second time, even though they delivered early preterm.