Table 3.

Overall mortality up to 4 months of follow-up: life table

Interval (months)		N at end of interval	Deaths	Lost	Survival	95% conf. interval
0	1	997	42	15	0.958	0.943	0.969
1	2	940	29	31	0.927	0.909	0.942
2	3	880	20	4	0.906	0.886	0.923
3	4	856	8	35	0.898	0.877	0.915