Table 2. Number of subjects, censored (%) and deaths (%) in the two cohorts: rural and urban.

	Rural		Urban
	Total	Without early one-year-death cases	Total	Without early one-year-death cases
No. of subjects	2294	2282	3333	3315
No. of censored (%)	42(1.8)	42(1.8)	102(3.1)	102(3.1)
No. of deaths (%)	143(6.2)	131(5.7)	225(6.8)	207(6.2)
Person-year of follow-up	17157.94	17152.22	22059.95	22050.39