Table 1.
Summary statistics of the MCBS-Medicare full and low pollution cohorts in comparison to other cohorts.
| Characteristic | MCBS-Medicare Full Cohort | MCBS-Medicare Low Pollution Cohort (Cohort with annual PM2.5 < 12 μg/m3) | American Cancer Society Cohort (Pope et al 1995, 2002)6,12 | Harvard Six Cities Study Cohort (Dockery et al NEJM 1993, Laden 2006)5,31 |
|---|---|---|---|---|
| Number of individuals | 32,119 | 18,144 | ~293,000 | ~8,000 |
| Mean age at enrollment | 72.0 | 72.3 | 58.6 | 49.7 |
| Number of years of follow up from interview date | 1 | 1 | 18 | 24 |
| Study period | 2002–2010 | 2002–2010 | 1982–2000 | 1974–1998 |
| Time period where exposure was measured | 2000–2010 | 2000–2010 | 1979–1983, 1999–2000 | 1979–1988, 1990–1998 |
| Spatial resolution for exposure assessment | ZIP codes (N=5,138) | ZIP codes (N=3,079) | Counties (N=50) | Cities (N=6) |
| PM2.5 (mean, IQR) during the study period (μg/m3) | 12 (3.41) | 10.18 (2.46) | 17.7 (3.7) | 16.4 (5.6) |
| No of confounders | 122 | 122 | ~50 | ~40 |