Table 2

Multinomial regression model prediction C-statistics with the addition of individual variables for postnatal days 1, 3, 7, 14 and 28*

Day 1		Day 3		Day 7		Day 14		Day 28
Variable	C-statistic	Variable	C-statistic	Variable	C-statistic	Variable	C-statistic	Variable	C-statistic
Birth weight	0.629	Respiratory support	0.629	Respiratory support	0.654	Respiratory support	0.669	Respiratory support	0.709
Respiratory support	0.655	Birth weight	0.664	Birth weight	0.674	FiO₂	0.688	FiO₂	0.728
Gestational age	0.660	FiO₂	0.678	FiO₂	0.686	Birth weight	0.694	Birth weight	0.731
FiO₂	0.668	Gestational age	0.682	Male	0.690	Male	0.696	Surgical NEC	0.737
Male	0.672	Male	0.686	Gestational age	0.692	Surgical NEC	0.699	Male	0.738
Antenatal steroids	0.674					Gestational age	0.702	Gestational age	0.741

*The C-statistic for each row corresponds to the model with the variable on that row and the variables above that row.
FiO₂, fraction of inspired oxygen; NEC, necrotising enterocolitis.