Table 3. Bivariate analysis of factors associated with length of hospital stay and medical expenses in patients with pulmonary abscess.

Variables	Length of hospital stay, days, M ± SD	P	Medical expenses, CNY, M ± SD	P
Sex		0.025		0.002
Male	23.1 ± 21.7		39,298 ± 64,604
Female	17.8 ± 9.8		23,571 ± 17,215
Baseline medical condition		0.54		0.44
Yes	22.5 ± 19.9		37,918 ± 54,592
No	20.7 ± 18.9		31,435 ± 60,288
Underlying extrapulmonary disease		0.03		0.07
Yes	25.3 ± 21.3		43,684 ± 61.892
Diabetes	31.0 ± 25.1		50,300 ± 65,398
Coronary artery disease	20.3 ± 22.2		31,421 ± 24,562
Hypertension	24.0 ± 20.1		32,508 ± 30,236
Cerebrovascular disease	25.7 ± 18.7		100,253 ± 118,543
No	19.0 ± 17.5		28,840 ± 52,023
Baseline pulmonary disease		0.41		0.28
Yes	19.6 ± 18.6		27,110 ± 21,325
Bronchiectasis	22.0 ±22.1		26,551 ± 19,805
Asthma	19.6 ± 9.9		29,552 ± 18,238
COPD	18.2 ± 15.7		27,999 ± 20,468
No	22.4 ± 19.7		37,800 ± 63,673
Clinical symptoms		0.30		<0.01
Respiratory failure/hypoxemia	23.7 ± 21.3		54,416 ± 87,723
Laboratory tests		<0.01		<0.01
Renal insufficiency	19.5 ± 8.02		57,945 ± 82,480
Liver dysfunction	28.3 ± 23.1		47,570 ± 64,005
Anemia	32.4 ± 32.5		77,815 ± 127,010
Electrolyte imbalance	25.7 ± 28.1		65,582 ± 105,803
Cardiac insufficiency	21.7 ± 14.7		67,798 ± 91,653
Hypoproteinemia	28.1 ± 27.6		71,885 ± 108,227

Note:

COPD, chronic obstructive pulmonary disease; CNY, Chinese yuan; M ± SD, mean ± standard deviation.