Table 4.

Multiple linear regression for hours of using oxygen

Variable	Linear regression model
	β	p value
Age (days)	−0.074	0.511
Z-score (W/A)	3.107	0.665
Z-score (W/L)	−5.030	0.482
Nutritional status	−12.931	0.333
Duration (days) of EB	−0.374	0.011
Presence of virus	23.268	0.023

EB=Exclusive breastfeeding; W/A=Weight-for-age; W/L=Weight-for-length