Table 2.

Investigated predictors of bacteremia within blood culture positives and negatives

	Total			Age 18 to 79			Age above 80
	Blood culture positives	Negatives	p value	Blood culture positives	Negatives	p value	Blood culture positives	Negatives	p value
	N = 90	N = 276		N = 45	N = 147		N = 45	N = 129
Male sex	28 (31.1%)	106 (38.4%)	0.212	16 (35.5%)	73 (49.6%)	0.097	12 (26.6%)	33 (25.5%)	0.886
History
Shaking chills	47 (52.2%)	70 (25.3%)	0.000*	26 (57.7%)	51 (34.6%)	0.006*	21 (46.6%)	19 (14.7%)	0.000*
Prior antibiotics use	6 (6.6%)	64 (23.1%)	0.000*	1 (2.2%)	35 (23.8%)	0.000*	5 (11.1%)	29 (22.4%)	0.071
Vital signs (mean±SD)
Blood pressure systolic (mmHg)	122 ± 26	119 ± 24	0.3347	118 ± 25	117 ± 24	0.8815	126 ± 26	121 ± 24	0.2523
Blood pressure diastolic (mmHg)	67 ± 13	66 ± 13	0.2877	67 ± 13	66 ± 12	0.7516	68 ± 12	65 ± 14	0.2456
Pulse rate (/min)	104 ± 20	101 ± 20	0.1877	107 ± 18	106 ± 21	0.6532	101 ± 21	95 ± 18	0.0929
Respiratory rate (/min)	24 ± 6.4	22 ± 5.0	0.0078*	22 ± 5.5	22 ± 5.0	0.4752	26 ± 6.6	23 ± 4.8	0.0033*
Body temperature (°C)	38.5 ± 1.0	37.8 ± 0.9	0.0000*	38.3 ± 1.0	38.0 ± 0.9	0.0393*	38.6 ± 1.1	37.7 ± 0.9	0.0000*
Laboratory markers (median [IQR])
White blood count (/μl)	11000[5900]	11000[5500]	0.2259	12000[5100]	11000[5100]	0.1381	10000[4000]	10800[4800]	0.7554
C-reactive protein (mg/dl)	7.0[10.2]	5.7[10]	0.1897	10[12.2]	7.0[10.2]	0.4398	6.0[9.2]	4.1[8.5]	0.1775

SD, standard deviation.

IQR, interquartile range.

*p<0.05.