Table 2.
Unadjusted and Adjusted Odds Ratios Showing the Association Between Each Environmental Factor and Pneumocystis Pneumonia Hospital Admissions Using 2 Weeks Before Admissions as a Control Time
| Environmental Exposure (Units) | Unadjusted OR (95% CI) | P Value | Adjusted OR (95% CI) | P Value |
|---|---|---|---|---|
| Temperature (°C) | 1.41 (1.14–1.75) | <.01 | 1.47 (1.15–1.88) | <.01 |
| SO2 (ppb) | 1.80 (1.15–2.83) | .01 | 3.04 (1.61–5.73) | <.01 |
| SO2 × CO | … | … | 0.41 (.18–.92) | .03 |
| SO2 (ppb)a | … | … | 2.45 (1.10–5.45) | <.01 |
| SO2 (ppb)b | … | … | 1.34 (1.07–2.60) | <.01 |
| Humidity (%) | 0.61 (.20–1.92) | .40 | 1.06 (.31–3.60) | .92 |
| NO2 (ppb) | 0.91 (.59–1.41) | .68 | 0.49 (.22–1.09) | .08 |
| PM10 (µg/m3) | 0.92 (.70–1.22) | .58 | 0.89 (.65–1.22) | .44 |
| Ozone <20 (ppb) | 1.10 (.73–1.64) | .66 | 1.11 (.90–1.36) | .34 |
| Ozone >20 (ppb) | 0.86 (.44–1.69) | .66 | 0.96 (.68–1.35) | .80 |
| CO (ppb) | 0.77 (.49–1.23) | .27 | 0.46 (.20–1.08) | .07 |
P value tests the significance of the effect of each independent variable on Pneumocystis pneumonia hospital admissions.
Abbreviations: CI, confidence interval; CO, carbon monoxide, NO2, nitrogen dioxide; OR, odds ratio; PM10, particulate matter up to 10 μm in size; ppb, parts per billion; SO2, sulfur dioxide.
a Effect of SO2 at the lower quartile of CO (5.89 ppb).
b Effect of SO2 at the upper quartile of CO (6.59 ppb).