Table 3. Chronic obstructive pulmonary disease: Underlying cause of death SMRs^a in the Libby, Montana Mortality Study 1979–2011.

	All cases			Non-worker cases
	Total (n=694)	Males	Females	Total (n=607)	Males	Females
Observed	187	99	88	173	86	87
Expectedb	155.68	88.41	67.27	155.68	88.41	67.27
SMR	1.20	1.12	1.31	1.11	0.97	1.29
CIc	1.04–1.39	0.91–1.36	1.05–1.61	0.95–1.29	0.78–1.20	1.04–1.60

^aSMRs standardized for age. Statistically significant results in bold.

^bExpected values rounded to second decimal point, hand calculations may not yield SMR results to the same level of accuracy that is presented here.

^c95% confidence interval.