Table 1.

Comparison of general data between two groups of patients

Items	Control group (n=46)	Observation group (n=46)	X 2/t	P
Gender (M/F, cases)	29/17	27/19	0.1825	0.6692
Age (x̅ ± s, yd)	67.46±5.21	68.55±5.39	0.9862	0.3267
Course of disease (x̅ ± s, years)	12.27±1.53	12.87±1.46	1.9242	0.0575
Smoking experience (yes/no, cases)	39/7	36/10	0.6494	0.4203
APACHE II score (x̅ ± s, points)	18.84±1.66	18.75±1.84	0.2463	0.8060
Heart rate (times/min)	98.67±8.12	97.84±8.75	0.4716	0.6384
Respiratory rate (times/min)	24.55±3.34	25.35±3.28	1.1591	0.2495