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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

From: The risks of warm nights and wet days in the context of climate change: assessing road safety outcomes in Boston, USA and Santo Domingo, Dominican Republic

Condition Non-Fatal Injury Property Damage
RR 95% CI RR 95% CI
Hot Days (TMAX ≥ 95thp) 1.09 (0.99, 1.21) 0.96 (0.86, 1.07)
Warm Days (85thp ≤ TMAX ≤ 95thp) 0.98 (0.91, 1.05) 0.94 (0.88, 1.01)
Warm Nights (TMIN ≤ 95thp) 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)
  1. Bold indicates RRs for which the 95% CI exclude the null (RR = 1.0), and p indicates percentile