Table 1

Estimated relative risks and 95% confidence limits for total, respiratory and cardiovascular mortality for an increase of 50 μg/m³ in air pollutants, in the general population and a cohort of COPD patients in Barcelona

	Black smoke 24 h	lag	SO₂24 h	lag	SO₂1 h	lag	NO₂24 h	lag	NO₂1 h	lag	O₃1 h	lag
Total mortality
general population^1-150	1.056	0-3	1.078	0-3	1.013	1	1.043	0-3	1.017	1	1.024	5
	1.027, 1.087		1.041, 1.116		1.004, 1.021		1.011, 1.076		1.006, 1.027		1.006, 1.042
COPD	1.023	0-2	1.045	0-2	1.036	2	1.145	0-2	1.023	2	1.040	3
	0.915, 1.145		0.914, 1.193		0.999, 1.074		1.006, 1.304		0.975, 1.115		0.953, 1.134
Respiratory mortality
general population^1-150	1.051	0-3	1.062	0-1	1.017	0	1.043	0-1	1.013	0	1.035	5
	0.975, 1.134		0.989, 1.141		0.994, 1.039		0.970, 1.122		0.983, 1.044		0.981, 1.092
COPD	1.071	0-2	1.041	0-2	1.050	2	1.161	0-2	1.084	2	1.057	3
	0.903, 1.271		0.849, 1.276		0.993, 1.110		0.944, 1.428		1.005, 1.169		0.921, 1.214
Cardiovascular mortality
general population^1-150	1.059	0-3	1.091	0-3	1.016	1	1.031	0-3	1.019	1	1.029	1
	1.019, 1.101		1.040, 1.144		1.005, 1.028		0.988, 1.076		1.004, 1.034		1.004, 1.054
COPD	0.908	0-2	1.035	0-2	1.067	3	1.056	0-2	1.032	3	1.011	3
	0.733, 1.124		0.808, 1.325		0.999, 1.140		0.827, 1.348		0.942, 1.130		0.858, 1.192

↵1-150 Partially published in reference 4.