TABLE 2.

ADJUSTED TOTAL MORTALITY RATE RATIOS AND 95% CONFIDENCE INTERVALS ESTIMATED FROM COX PROPORTIONAL HAZARDS MODEL FOR EACH FOLLOW-UP PERIOD (1974–1989 AND 1990–1998) AND THE COMPLETE FOLLOW-UP (1974–1998)

	Period 1	Period 2	Complete
Person-Yr of Follow-up	104,243	54,735	158,978
Deaths	1,364	1,368	2,732
	RR (95% CI)	RR (95% CI)	RR (95% CI)
City-specific model*
Portage	1.00		1.00
Topeka	1.06 (0.86–1.31)	1.01 (0.83–1.22)	1.03 (0.89–1.19)
Watertown	1.06 (0.87–1.28)	0.82 (0.67–1.00)	0.95 (0.83–1.08)
Harriman	1.19 (0.98–1.44)	1.10 (0.91–1.33)	1.15 (1.01–1.32)
St. Louis	1.15 (0.96–1.38)	0.96 (0.80–1.15)	1.05 (0.93–1.20)
Steubenville	1.31 (1.10–1.57)	1.06 (0.89–1.27)	1.18 (1.04–1.34)
Period	1.00	0.97 (0.70–1.35)

Definition of abbreviations: CI = confidence interval; RR = rate ratio.

Rate ratios have been adjusted for age in 1-yr categories, sex, current smoker, current pack-years of smoking, former smoker, former pack-years of smoking, less than high school education, and linear and quadratic terms for body mass index.

^*City-specific rate ratios are all expressed in relation to Portage.