Table 3.

Correlations between the variables studied and the length of hospital stay and oxygen-use

Variable (n=175)	Hospital stay		Oxygen-use
	r∗	p value	r∗	p value
Age	-0.254	0.001	−0.222	0.003
Z-score (L/A)	−0.008	0.913	−0.004	0.954
Z–score (W/L)	−0.107	0.159	−0.164	0.030
Z–score (W/A)	−0.136	0.072	−0.168	0.026
Duration (days) of EB	−0,265	<0,001	−0,333	<0,001

∗ Spearman's correlation coefficient; EB=Exclusive breastfeeding; L/A=Length-for-age; W/A=Weight-for-age; W/L=Weight-for-length