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The NHS air pollution study (n = 92,140)
| N of cases (person-months) | 6,211 (6,428,433) |
| Follow up period (month/year) | June, 2000–June, 2006 |
| Age at study entry (years): | |
| Median (range) | 65 (53,86) |
| Region: | |
| Northeast | 50% |
| Midwest | 17% |
| West | 14% |
| South | 19% |
| Monthly PM2.5(µg/m3): | |
| Mean (sd) | 13.7 (4.0) |
| ICC | 0.40 |
