Linear regression exploring the role of birthweight/placental weight ratio on the association between distress measures and ln-transformed normalized umbilical vein blood flow.

Results from linear regression analyses showing associations between ordinal and dichotomous distress measures at 16 weeks gestational age and ln-transformed umbilical vein blood flow normalized for fetal abdominal circumference (Ln-QUVAC, ml/min/cm) at 30 weeks, with adjustment for birthweight/placental weight ratio. aDistress measures n = 65, Bw/Pw ratio n = 61. bB, regression coefficient; Bw/Pw, birthweight/placental weight. GHQ, General Health Questionnaire; IES, Impact of Event Scale; T1, assessment at around 16 weeks gestational age.