Table 2 Explanatory Variable Descriptions. A summary of variables used in modeling is provided. Interactions between these variables were also considered
Variable | Measure Description and Usage | Reference |
|---|---|---|
PM2.5 | Daily 1-km gridded surface PM2.5 estimates were the primary exposure of interest. We extracted PM2.5 values at each case event address on date of visit, all 14Â days prior to the date of case event for investigating short-term exposure effects, and referent days for the case-cross over design (details provided in text) | [79] |
Temperature | Daily 4-km gridded gridMET data were used to extract surface maximum temperature at each case event address on date of visit and corresponding referent days | [1] |
Season | At each case event day and corresponding referent days, a categorical variable to indicate the season was used for summer (June–Aug), fall (Sep–Nov), winter (Dec–Feb), and spring (Mar–May) | - |