Table 2.

Comparison of baseline data.

	Research group	Control group	t or χ2	P value
Age	52.9 ± 15.7	50.9 ± 16.4	0.616	0.504
BMI (kg/m2)	18.63 ± 4.94	18.21 ± 4.22	0.375	0.709
Family history of illness			0.127	0.722
Yes vs. no	1 vs. 28	2 vs. 36
Gender			0.043	0.836
Male vs. female	16 vs. 13	20 vs. 18
Type of infection			0.294	0.587
Community acquired vs. hospital acquired	18 vs. 11	26 vs. 12
Smoking			0.401	0.527
Yes vs. no	16 vs. 13	18 vs. 20
Drinking			0.246	0.620
Yes vs. no	9 vs. 20	14 vs. 24
Living environment			0.638	0.425
City vs. countryside	24 vs. 5	34 vs. 4
Nationality			0.127	0.722
Han nationality vs. ethnic minorities	28 vs. 1	36 vs. 2
Marital status			0.325	0.569
Married vs. unmarried	22 vs. 7	31 vs. 7
Education			0.175	0.676
High school or below vs. higher than high school	10 vs. 19	15 vs. 23