Table 3.

 Logistic regression relating significant bacteraemia to full blood count

	Culture negative (n = 6652)		Culture positive (n = 530)		Univariate				Multivariate
	Mean	SD	Mean	SD	OR	95% CI	Wald	p Value	OR	95% CI	Wald	p Value
Age	64.3	21.5	68.4	19.8	1.01	(1.01 to 1.01)	18	<0.001	1.00	(1.00 to 1.01)	1.8	0.17
WBC (×109/l)	11.3	7.4	14.2	8.9	1.04	(1.02 to 1.05)	39	<0.001	Not entered
Lymphocytes (×109/l)	1.30	0.90	0.85	0.72	0.35	(0.29 to 0.41)	140	<0.001	0.3	(0.24 to 0.37)	114	<0.001
Neutrophils (×109/l)	8.9	5.2	12.4	8.4	1.09	(1.07 to 1.10)	165	<0.001	1.12	(1.06 to 1.15)	95	<0.001
Neutrophil–lymphocyte interaction	2.4	6.9	6.9	12.5	1.07	(1.06 to 1.08)	165	<0.001	0.97	(0.95 to 0.98)	15	<0.001

Univariate and multivariate logistic regression of admission peripheral blood count with blood culture positivity. Wald refers to the Wald statistic.

CI, confidence interval; OR, odds ratio; WBC, white blood cell count.