Table 3.

Distance (miles) of residence from closest ambient pollutant monitors for the KPNC cohort, 1996–2010.

Air pollutant	n	Mean	Standard deviation	Minimum	Maximum
24-hr PM2.5	5,503	7.63	5.91	0.15	48.70
24-hr PM10	6,913	6.05	4.24	0.11	35.35
24-hr SO2	6,687	14.93	10.74	0.14	49.50
24-hr NO2	6,910	6.45	4.78	0.11	45.91
8-hr O3	6,913	4.66	3.12	0.05	36.74
8-hr CO	6,907	6.23	4.70	0.05	43.15
KPNC, Kaiser Permanente of Northern California.