Table 2. - Test of proportionality of risks. Belo Horizonte, MG, Brazil, 2014.

Variables	p*	T†	p value
O2 per room air	-0.20126	3.69	0.0547
Blinking more than five times per minute	0.12170	1.89	0.1691
Vascular disease	0.02095	0.05	0.8185
GLOBAL	NA	5.52	0.1373

*Pearson correlation coefficient estimated between the Schoenfeld standardized residues and the variable time response before the occurrence of the outcome †Statistics of the test with Chi-square distribution, 3 degrees of freedom, approximately