Table 2 -. Accumulated probability of survival of patients with sickle cell disease; comparison between those who use hydroxyurea (N=39) and those who do not (N=24), in two public hospitals of the state of Mato Grosso do Sul, Brazil, between 1980 and 2010.

Follow-up time (months)	Accumulated probability of survival with use of hydroxyurea (N=39)	Accumulated probability of survival without use of hydroxyurea (N=24)	Log Rank p
24	0.70	0.50	0.014
48	0.62	0.34
120	0.40	0.20
240	0.32	0.08
480	-	0.08