Figure 1From: All-cause mortality and risk factors in a cohort of retired military male veterans, Xi'an, China: an 18-year follow up study Comparison of cumulative survival rate of different smoking index groups. Figure 1 shows a comparison of cumulative survival rate in different smoking index groups. Cumulative survival rate decreased with increasing smoking index. Although differences between group1 (smoking index<350) and group2 (350<smoking index<569), group2 and group3 (569<smoking index<749) were not significant, there were significant differences between the other two groups (P < 0.05).Back to article page