Table 2.
Logistic regression models predicting bacteraemia in derivation set
| Term | No bacteraemia (n = 3821) | Bacteraemia (n = 324) | Univariate analysis (n = 4145) | Multivariate model, CRP not included (n = 4145) | Multivariate model, CRP included (n = 4145) | |||||||||||
| Mean | SD | Mean | SD | OR | 95% CI | Wald | p Value | OR | 95% CI | Wald | p Value | OR | 95% CI | Wald | p Value | |
| Constant | – | – | – | – | – | – | – | – | 0.18 | – | – | – | 0.13 | – | – | – |
| Age | 64 | 22 | 70 | 19 | 1.011 | 1.005 to 1.016 | 15 | <0.01 | 1.007 | 1.001 to 1.013 | 5.8 | 0.016 | 1.007 | 1.001 to 1.013 | 5.0 | 0.024 |
| CRP (mg/l) | 76 | 81 | 147 | 95 | 1.008 | 1.007 to 1.009 | 182 | <0.01 | Not entered | 1.006 | 1.005 to 1.007 | 82 | <0.01 | |||
| Log lymphocytes | 0.28 | 0.28 | −0.20 | 0.37 | 0.101 | 0.071 to 0.14 | 170 | <0.01 | 0.053 | 0.028 to 0.100 | 82 | <0.01 | 0.072 | 0.037 to 0.138 | 62 | <0.01 |
| Neutrophils | 8.9 | 5.1 | 12.1 | 7.4 | 1.087 | 1.07 to 1.10 | 109 | <0.01 | 1.089 | 1.068 to 1.109 | 77 | <0.01 | 1.054 | 1.032 to 1.076 | 24 | <0.01 |
| CRP* Neutrophils | – | – | – | – | 1.0003 | 1.0003 to 1.0004 | 160 | <0.01 | Not entered | – | – | – | NS | |||
| Neutrophil* log lymphocytes | – | – | – | – | 0.840 | 0.82 to 0.87 | 130 | <0.01 | 1.070 | 1.024 to 1.117 | 9.3 | <0.01 | 1.058 | 1.011 to 1.106 | 5.96 | 0.015 |
| CRP* log lymphocytes | – | – | – | – | 0.984 | 0.98 to 0.99 | 1818 | <0.01 | Not entered | – | – | – | NS | |||
CI, confidence interval; CRP, C reactive protein; OR, odds ratio; Wald, wald statistic.