Table 2

Results of the multivariate regression analysis

Basal cortisolPeak cortisolΔCort0–30
CoefficientSEp ValuesR2 (%)CoefficientSEp ValuesR2 (%)CoefficientSEp ValuesR2 (%)
SE, standard error; IPPV, intermittent positive pressure ventilation; HFOV, high frequency oscillatory ventilation.
Lowest systolic pressure0.0160.0100.11522.60.0100.0040.01180.25.0231.8040.00618.4
No antenatal dexamethasone−0.4610.178< 0.001−0.1570.0660.019−63.34531.8680.049
Antenatal dexamethasone (1–2 doses)−0.5770.2040.006−0.1410.0760.067−65.18236.7120.078
Mode of mechanical ventilation (IPPV/HFOV)−0.6540.164< 0.001−0.1650.0630.010−82.50230.4950.008
(Ln) Basal cortisol (day 7)0.5430.033< 0.001−34.03516.0260.036
Lowest mean pressure−0.0350.0140.01125.20.0150.0050.00380.68.5192.8520.00319.1
No antenatal dexamethasone−0.4520.1750.011−0.1550.0650.019−56.77531.5810.075
Antenatal dexamethasone (1–2 doses)−0.5720.2000.005−0.1410.0750.062−62.17136.4430.091
Mode of mechanical ventilation (IPPV/HFOV)−0.5550.1670.001−0.1500.0630.020−78.43230.5950.012
(Ln) Basal cortisol (day 7)0.5320.033< 0.001−38.50316.2010.019
Lowest diastolic pressure0.0400.0160.01325.00.0210.006< 0.00181.26.4792.5120.01117.1
No antenatal dexamethasone−0.4290.1750.016−0.1450.0640.025−60.81931.9460.059
Antenatal dexamethasone (1–2 doses)−0.5600.2010.006−0.1380.0740.063−63.59836.8430.087
Mode of mechanical ventilation (IPPV/HFOV)−0.5640.1660.001−0.1370.0620.029−82.39831.0100.009
(Ln) Basal cortisol (day 7)0.5290.033< 0.001−37.31416.3680.024