Table 2

Multiple regression analysis with ln transformed plasma adrenaline and noradrenaline concentrations (means per patient) as outcome variables

	Adrenaline			Noradrenaline
	B*	95% CI of B	p Value	B*	95% CI of B	p value
Gestational age (p = 0.81 and 0.67), baseline adrenaline and noradrenaline concentrations (ln transformed) (p = 0.21 and 0.13), and prenatal corticosteroid use (only in adrenaline analyses; p = 0.42) were excluded from the analysis (p>0.1) by using the backward method. p Values in bold are significant.
*Unstandardised regression coefficients.
†The mean amount of extra morphine used for each infant in μg/kg per hour during study.
‡Birth weight was compared with normal mean birth weight for each patient, as a measure of small for gestational age infants.
Condition (placebo/morphine)	−0.079	−0.20 to 0.037	0.18	−0.25	−0.48 to −0.027	0.029
Amount of extra morphine†	−0.0091	−0.028 to 0.010	0.34	−0.0081	−0.046 to 0.030	0.67
Deviation birth weight‡	−0.039	−0.077 to 0.001	0.046	−0.091	−0.17 to −0.015	0.019
Dopamine infusion	0.23	0.082 to 0.37	0.003	0.42	0.13 to 0.71	0.005
Prenatal corticosteroids				0.41	0.17 to 0.65	0.001
Participating centre	−0.11	−0.24 to 0.013	0.078	−0.23	−0.47 to 0.004	0.054
	R = 0.50, R_adj² = 0.20			R = 0.64, R_adj² = 0.36