“…However, the coefficient of determination r 2 of 0.46 indicated that only 46% of the variability of the plasma bilirubin concentrations was predicted by the TcB measurements. Several confounders have been described previously, such as gestational age (5,11,18), postnatal age (5, 10), intermeter and laboratory variability (7,15,19), respiratory insufficiency (5,11), or basal yellow skin colour (5). In our data, using backward selection multiple regression analysis, only TcB measurements and birthweight were independently associated with the plasma bilirubin concentration.…”