Table 2.

Some laboratory variables in patients with lower respiratory tract infection.

Variable	At Initial diagnosis
	Group1(n = 26) Mean ± SD	Group 2 (n = 34) Mean ± SD	Test value t p
White blood cell (×106/L)	19.9 ± 4.9	22.6 ± 7.8	0.39	>0.05
CRP (mg/L)	15.9 ± 6.8	44.8 ± 26.2	0.36	<0.05⁎
Procalcitonin (ng/mL)	1.2 ± 0.9	4.8 ± 3.9	8.05	<0.001⁎⁎
Blood gases
Pa O2 (mm Hg)	86.9 ± 8.5	83.7 ± 9.4	0.61	>0.05
Pa CO2 (mm Hg)	41.7 ± 8.8	42.8 ± 9.0	0.73	>0.05
pH	7.3 ± 0.01	7.4 ± 0.02	0.08	>0.05

^⁎P value is significant at < 0.05.

^⁎⁎P value highly significant at < 0.001.