Characteristics of cases of acute myocardial infarction and population controls in greater Worcester, MA, and by section of the study area
| All | Section 1 | Section 2 | Section 3 | |||||
| Cases | Controls | Cases | Controls | Cases | Controls | Cases | Controls | |
| n | 4565 | 10 277 | 1570 | 3573 | 2126 | 4907 | 869 | 1797 |
| Demographic characteristics and AMI order | ||||||||
| Mean age (SD) | 70 (14) | 70 (14) | 70 (14) | 70 (14) | 71 (14) | 71 (14) | 68 (14) | 67 (14) |
| Male, % | 57.3 | 56.8 | 60.4 | 60.1 | 54.6 | 54.2 | 58.3 | 57.4 |
| Previous AMI, % | 29.7 | – | 26.8 | – | 33.0 | – | 27.0 | – |
| Block group socioeconomic position | ||||||||
| Median income, $K | 48 | 50 | 60 | 60 | 38 | 41 | 52 | 54 |
| Residents living below the poverty line, % | 11 | 9 | 5 | 4 | 16 | 14 | 7 | 6 |
| Residents with less than high school education, % | 18 | 16 | 10 | 10 | 24 | 21 | 17 | 16 |
| Point source PM2.5 emission density tons per m2 (SD) | 0.4 (2.7) | 0.4 (2.5) | 0.04 (0.5) | 0.04 (0.6) | 0.7 (3.9) | 0.7 (3.6) | 0.02 (0.2) | 0.04 (0.5) |
| Mean traffic within 100 m of residence vehicles*km | 1145 | 1060 | 780 | 670 | 1635 | 1488 | 604 | 665 |
| Traffic particles modelled at residence | ||||||||
| PM2.5 filter reflectance, 1E-5 m−1 | ||||||||
| Mean | 0.35 | 0.34 | 0.31 | 0.31 | 0.42 | 0.40 | 0.26 | 0.25 |
| SD | 0.13 | 0.13 | 0.13 | 0.14 | 0.10 | 0.10 | 0.11 | 0.11 |
| 5th Percentile | 0.14 | 0.12 | 0.12 | 0.10 | 0.25 | 0.25 | 0.09 | 0.09 |
| 25th Percentile | 0.25 | 0.24 | 0.20 | 0.19 | 0.34 | 0.33 | 0.16 | 0.15 |
| 50th Percentile | 0.35 | 0.35 | 0.30 | 0.29 | 0.42 | 0.40 | 0.25 | 0.25 |
| 75th Percentile | 0.45 | 0.44 | 0.41 | 0.41 | 0.49 | 0.48 | 0.34 | 0.33 |
| 95th Percentile | 0.56 | 0.54 | 0.53 | 0.53 | 0.58 | 0.57 | 0.46 | 0.44 |