Table 5 Relative risk (RR) with 95% confidence interval (CI) of traffic collisions resulting in non-fatal injury or property damage on warm-season days with extreme heat or precipitation in Boston, MA

Hot Days (T_MAX ≥ 95^thp)

1.09

(0.99, 1.21)

0.96

(0.86, 1.07)

Warm Days (85^thp ≤ T_MAX ≤ 95^thp)

0.98

(0.91, 1.05)

0.94

(0.88, 1.01)

Warm Nights (T_MIN ≤ 95^thp)

0.87

(0.78, 0.98)

0.91

(0.82, 1.01)

Wet Days (> 0 mm)

1.19

(1.13, 1.25)

1.25

(1.19, 1.31)

Very Wet Days (>mean)

1.27

(1.19, 1.34)

1.36

(1.29, 1.43)

Extremely Wet Days (>mean of rainy days)

1.25

(1.16, 1.34)

1.42

(1.33, 1.51)