GZLM parameters for neonatal predictors of hair cortisol level at age 7 years in preterm boys.

aB is the unstandardized regression coefficient showing the effect on the outcome variable per unit change of each individual predictor.bThe confidence interval did not include 0, therefore power was adequate.cNumber of skin-breaking procedures from birth to term, including each attempt (e.g. intubation, injection, line insertion, heel lance).dExposure to morphine (IV and PO combined after appropriate conversion) from birth to term was calculated as the average dose (mg/kg) per day adjusted for daily weight multiplied by the number of days on the drug.