2020
DOI: 10.1016/j.scitotenv.2020.140093
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Short-term effects of specific humidity and temperature on COVID-19 morbidity in select US cities

Abstract: • We studied daily temperature and humidity in COVID-19 morbidity. • We used a case-crossover and distributed lag nonlinear model. • We observed non-linear associations with humidity and temperature. • Humidity was the best predictor of COVID-19 transmission. • Results varied across select US cities despite accounting for social distancing measures.

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Cited by 108 publications
(110 citation statements)
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“…cases [3]. This study was similar to ours that humidity was a risk factor under higher humidity conditions and there was no correlation under lower humidity conditions.…”
Section: Discussionsupporting
confidence: 90%
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“…cases [3]. This study was similar to ours that humidity was a risk factor under higher humidity conditions and there was no correlation under lower humidity conditions.…”
Section: Discussionsupporting
confidence: 90%
“…1 , 2 were the vector of regression coefficients for cb.Temp, cb.RH, which were the cross-basis matrix of temperature, relative humidity. The maximum lag day was set as 7 days, which was based on previous studies [3]. We allowed for non-linear relationships by using a natural cubic spline with 3 degrees of freedom (df), and the lagged effects were modeled using a natural cubic spline with an intercept and three internal knots placed at equally-spaced log-values.…”
Section: Resultsmentioning
confidence: 99%
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“…In contrast, one study using multivariate analyses for three regions in Italy that compared climatic factors in relation to daily COVID-19 confirmed cases demonstrated an inverse correlation of temperature with daily incidence (Pirouz et al, 2020). A number of studies have also attempted to model lag effects of climatic predictors, though these have so far been limited to select regions (Runkle et al, 2020), relatively narrow temperature ranges (Passerini et al, 2020;Bashir et al, 2020;Tosepu et al, 2020), relatively short time series (Shi et al, 2020) and lag periods (Tobías and Molina, 2020), all of which may induce significant biases.…”
Section: Introductionmentioning
confidence: 99%