Table 3.

Severe ROP regression models – SpO₂

90% threshold
	Wald Z statistic	P value	VIF
EGA	−2.34	0.02*	2.93
BW centile	−1.36	0.17	1.81
Male sex	−0.25	0.80	1.87
Caucasian race	1.25	0.21	1.33
Complete antenatal steroid treatment	1.50	0.13	1.87
Antenatal magnesium exposure	0.59	0.55	1.88
Vaginal delivery	−1.79	0.07	2.36
Inotrope exposure	2.16	0.03*	2.87
BPD	0.45	0.65	1.01
Mean % FiO2	−0.70	0.48	2.07
Hyperoxia burden	0.99	0.32	3.51
Model: R2=0.68, p<0.01*
93% threshold
	Wald Z statistic	P value	VIF
EGA	−2.36	0.01*	1.47
BW centile	−1.30	0.19	1.89
Male sex	−0.17	0.87	1.90
Caucasian race	1.42	0.15	1.32
Complete antenatal steroid treatment	1.59	0.11	1.88
Antenatal magnesium exposure	0.45	0.65	1.75
Vaginal delivery	−1.61	0.10	1.98
Inotrope exposure	2.18	0.03*	2.16
BPD	0.45	0.65	1.01
Mean % FiO2	−0.88	0.37	2.06
Hyperoxia burden	0.88	0.37	2.37
Model: R2=0.68, p<0.01*
95% threshold
	Wald Z statistic	P value	VIF
EGA	−2.36	0.02*	2.23
BW centile	−1.20	0.22	1.80
Male sex	−0.22	0.82	1.87
Caucasian race	1.45	0.14	1.32
Complete antenatal steroid treatment	1.60	0.10	1.82
Antenatal magnesium exposure	0.36	0.72	1.66
Vaginal delivery	−1.52	0.12	2.01
Inotrope exposure	2.12	0.03*	1.96
BPD	0.45	0.65	1.01
Mean % FiO2	−0.96	0.33	2.10
Hyperoxia burden	0.68	0.49	2.05
Model: R2=0.67, p<0.01*

^*Denotes significance at p ≤ 0.05.