Table 2. Univariate and multivariable logistic regression models for the association of immediate meteorological parameters and the etiology of bloodstream infections.
| Predictive factors | Crude OR | 95%CI | Adjusted OR1 | 95%CI | Adjusted OR2 | 95%CI | Adjusted OR3 | 95%CI | Adjusted OR3 | 95%CI |
|---|---|---|---|---|---|---|---|---|---|---|
| Bacteria 1,417 versus Fungi 204 | ||||||||||
| Temperature (°C) | 1.25 | 1.19;1.32 | 1.25 | 1.18;1.31 | 1.25 | 1.19;1.32 | 1.26 | 1.19;1.33 | 1.26 | 1.19;1.33 |
| Relative humidity (%) | 1.04 | 1.02;1.05 | 1.04 | 1.02;1.05 | 1.04 | 1.02;1.05 | 1.03 | 1.02;1.05 | 1.03 | 1.02;1.05 |
| Intensive care unit | – | – | 0.71 | 0.52;0.99 | 0.88 | 0.63;1.24 | 0.88 | 0.63;1.24 | ||
| Time since admission | – | – | 1.00 | 0.99;1.01 | 1.00 | 0.99;1.01 | 1.00 | 0.99;1.01 | ||
| Age (years) | – | – | – | 1.02 | 1.01;1.03 | 1.02 | 1.01;1.03 | |||
| Sex feminine | – | – | – | 1.03 | 0.75;1.40 | 1.03 | 0.75;1.40 | |||
| GNB 790 versus GPC 627 | ||||||||||
| Temperature (°C) | 1.12 | 1.08;1.17 | 1.14 | 1.10;1.19 | 1.14 | 1.10;1.19 | 1.14 | 1.10;1.19 | 1.14 | 1.10;1.19 |
| Relative humidity (%) | 0.96 | 0.95;0.97 | 0.96 | 0.95;0.97 | 0.96 | 0.95;0.97 | 0.96 | 0.95;0.97 | 0.96 | 0.95;0.97 |
| Intensive care unit | – | – | 0.79 | 0.62;1.00 | 0.75 | 0.59;0.96 | 0.75 | 0.59;0.96 | ||
| Time since admission | – | – | 1.00 | 0.99;1.00 | 1.00 | 0.99;1.00 | 1.00 | 0.99;1.00 | ||
| Age (years) | – | – | – | 1.00 | 0.99;1.00 | 1.00 | 0.99;1.00 | |||
| Sex feminine | – | – | – | 1.21 | 0.98;1.51 | 1.21 | 0.98;1.51 | |||
| Acinetobacter baumannii 177 versus other GNB 613 | ||||||||||
| Temperature (°C) | 1.23 | 1.14;1.33 | 1.26 | 1.16;1.37 | 1.26 | 1.16;1.38 | 1.26 | 1.16;1.37 | 1.26 | 1.16;1.37 |
| Relative humidity (%) | 0.95 | 0.93;0.96 | 0.94 | 0.93;0.96 | 0.94 | 0.93;0.96 | 0.94 | 0.93;0.96 | 0.94 | 0.93;0.96 |
| Intensive care unit | – | – | 0.73 | 0.49;1.11 | 0.75 | 0.49;1.13 | 0.75 | 0.49;1.13 | ||
| Time since admission | – | – | 1.00 | 0.99;1.00 | 1.00 | 0.99;1.00 | 1.00 | 0.99;1.00 | ||
| Age (years) | – | – | – | 1.00 | 0.99;1.01 | 1.00 | 0.99;1.01 | |||
| Sex feminine | – | – | – | 0.89 | 0.62;1.28 | 0.89 | 0.62;1.28 | |||
GNB: Gram-negative bacilli; GPC: Gram-positive cocci
Note: For the purpose of this study, immediate parameters indicate temperature and relative humidity for the seven days preceding the collection of blood cultures. The number of cases in each category is stated in parenthesis. Crude odds ratio (OR) refers to univariate analysis. The following columns present the adjusted OR in multivariable models, including, the meteorological parameters, admission data, and demographics of cases, in a cumulative fashion.
Bold values indicate statistical significance.