Table 1.
Boston 1999–2009; descriptive statistics of mortality, and exposure variables in total and by cluster
| Cluster 1 1068 days |
Cluster 2 526 days |
Cluster 3 272 days |
Cluster 4 376 days |
Cluster 5 603 days |
Total 4018 days |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | N | |
| Total mortality | 53.7 | 9.0 | 54.2 | 8.4 | 61.2 | 9.3 | 53.5 | 8.2 | 60.0 | 9.4 | 56.0 | 9.5 | 4018 |
| Temperature (°C) | 12.0 | 8.4 | 13.8 | 7.8 | 3.3 | 6.5 | 20.6 | 6.6 | 3.0 | 7.1 | 10.8 | 9.4 | 4017 |
| Dew point temp (°C) | 5.4 | 9.5 | 6.9 | 9.0 | −2.3 | 8.0 | 14.4 | 6.8 | −3.5 | 9.5 | 4.4 | 10.4 | 4017 |
| PM2.5 (µg/m3) | 6.9 | 3.4 | 10.1 | 4.1 | 13.4 | 5.2 | 17.7 | 6.4 | 8.2 | 3.3 | 9.8 | 5.5 | 3683 |