Table 2 Incidence rate ratios for COVID-19 derived from negative binomial regression showing both unadjusted and multivariable-adjusted analyses comparing days where wind speed < 8.85 KPH to days with ≥ 8.85 KPH wind speeds from March 16th–December 31st, 2020

Variable

IRR [95% C.I.]

aIRR [95% C.I.]

Wind speed < 8.85 KPH when temperature 16–28 °C

4.09 [3.16–5.28]

P < 0.001

1.45 [1.28–1.64]

P < 0.001

Wind speed < 8.85 KPH when temperature ≤ 15 or ≥ 29 °C

1.45 [1.04–2.03]

P = 0.029

1.03 [0.88–1.20]

P = 0.717

Maximal exterior temperature, °C

0.99 [0.99–1.00]

P = 0.021

Days since lockdown

0.94 [0.93–0.96]

P < 0.001

Days since reopening

1.07 [1.05–1.09]

P < 0.001

Holiday adjustment

1.12 [0.94–1.34]

P = 0.208

Snowfall, mm

0.93 [0.82–1.06]

P = 0.274

Rainfall, mm

1.02 [0.88–1.20]

P = 0.774

Eight-day forward/backward moving average

1.21 [1.19–1.24]

P < 0.001

α

1.02 [0.88–1.17]

0.16 [0.13–0.19]