Skip to main content

Table 1 Incidence rate ratios for COVID-19 derived from negative binomial regression showing both unadjusted and multivariable-adjusted analyses from March 16th–December 31st, 2020

From: A wind speed threshold for increased outdoor transmission of coronavirus: an ecological study

  Unadjusted Multivariable-adjusted
Variable IRR [95% C.I.] aIRR [95% C.I.]
Wind speed (Ln–KPH) when temperature 16–28 °C 1.85 [1.67–2.06]
P < 0.001
1.17 [1.09–1.26]
P < 0.001
Wind speed (Ln–KPH) when temperature ≤ 15 or ≥ 29 °C 1.04 [0.79–1.36]
P = 0.798
0.93 [0.81–1.06]
P = 0.248
Maximal exterior temperature, °C   1.00 [0.99–1.01]
P = 0.677
Days since lockdown   0.95 [0.93–0.97]
P < 0.001
Days since reopening   1.06 [1.04–1.08]
P < 0.001
Holiday adjustment   1.11 [0.92–1.33]
P = 0.264
Snowfall, cm   0.98 [0.92–1.04]
P = 0.540
Rainfall, cm   1.01 [0.94–1.09]
1.02 P = 0.776
Eight-day forward/backward moving average   1.22 [1.20–1.25]
P < 0.001
α 0.98 [0.85–1.13] 0.17 [0.14–0.2]
  1. IRR incidence rate ratio, 95% C.I. 95% confidence interval. All models additionally adjust for day of the week in which cases were reported and for the size of the county population adjusted for reductions due to death or recovery from COVID-19 during the period of observation. α is a measure of dispersion. P-values derived from Student’s T-tests