Table 3. Prevalence rate ratio of MRSA colonization by monthly meteorological variables and latitude among 24, 704 ICU patients across 20 US sites, September 2011 to October 2012.
| Variable | Model 1* | Model 2 ** | ||
|---|---|---|---|---|
| Prevalence Rate Ratio | P value | Prevalence Rate Ratio | P value | |
| Mean temperature (°F) | 1.003 | 0.220 | 1.000 | 0.962 |
| Relative humidity (%) | 1.009 | 0.010 | 1.010 | 0.004 |
| Total precipitation (Inches) | 1.024 | 0.139 | 1.006 | 0.693 |
| Latitude (°) | - | - | 0.977 | 0.001 |
*Multivariate model included the following variables: mean temperature, relative humidity, and total precipitation.
** Multivariate model included the following variables: latitude, mean temperature, relative humidity, and total precipitation.