TABLE 3—
Relative Risk of Dispatch Calls for Each Agency on Days Meeting Specific Temperature or Heat Index Thresholds Compared With All Other Days, Calculated During the Warm Season: Boston, MA, 2010–2014
| Temperature Metric | RR (95% CI) |
| Boston Police Department | |
| TMAX ≥ 90°F (1 d) | 1.02 (1.00, 1.05) |
| TMAX ≥ 90°F (2 d) | 1.02 (0.99, 1.06) |
| TMAX ≥ 90°F (3 d) | 1.01 (0.97, 1.05) |
| HIMAX ≥ 95°F (1 d) | 1.02 (1.00, 1.04) |
| HIMAX ≥ 95°F (2 d) | 1.02 (1.00, 1.04) |
| HIMAX ≥ 95°F (3 d) | 1.01 (0.99, 1.04) |
| Boston Emergency Medical Services | |
| TMAX ≥ 90°F (1 d) | 1.09 (1.07, 1.12) |
| TMAX ≥ 90°F (2 d) | 1.10 (1.06, 1.14) |
| TMAX ≥ 90°F (3 d) | 1.10 (1.05, 1.15) |
| HIMAX ≥ 95°F (1 d) | 1.07 (1.05, 1.09) |
| HIMAX ≥ 95°F (2 d) | 1.06 (1.04, 1.09) |
| HIMAX ≥ 95°F (3 d) | 1.06 (1.03, 1.09) |
| Boston Fire Department | |
| TMAX ≥ 90°F (1 d) | 1.10 (1.05, 1.15) |
| TMAX ≥ 90°F (2 d) | 1.10 (1.04, 1.17) |
| TMAX ≥ 90°F (3 d) | 1.13 (1.05, 1.22) |
| HIMAX ≥ 95°F (1 d) | 1.07 (1.04, 1.10) |
| HIMAX ≥ 95°F (2 d) | 1.06 (1.02, 1.10) |
| HIMAX ≥ 95°F (3 d) | 1.06 (1.01, 1.11) |
Note. CI = confidence interval; HIMAX = maximum heat index; RR = relative risk; TMAX = maximum temperature. Warm season was defined as May through September. RR analyses for days with HIMAX ≥ 95°F were calculated only for days when the temperature (> 80°F) and relative humidity (> 40%) are within the bounds of the National Weather Service heat index calculation.