Table 1.

Univariate analysis of patients

Factor	Infection group (n = 90)	Uninfected group (n = 21)	χ2 value	P value
Age
≥ 55 years	68	10	6.361	0.012
< 55 years	22	11
Gender
Male	50	13	0.280	0.597
Female	40	8
Body mass index
≥ 25 kg/m2	22	6	0.154	0.695
< 25 kg/m2	68	15
Bacterial infection of donor lung
Yes	36	3	4.940	0.026
No	54	18
Oxygenation index
≥ 300/mmHg	58	17	2.117	0.146
< 300/mmHg	32	4
Type of disease
Idiopathic interstitial pulmonary fibrosis	21	5	0.748	0.862
Secondary interstitial pulmonary fibrosis	23	5
Pneumoconiosis	11	4
The rest	35	7
Functional status
Activity limitations	80	18	0.166	0.684
No activity restrictions	10	3
History of hypertension
Yes	27	6	0.017	0.897
No	63	15
History of smoking
Yes	55	15	0.778	0.378
No	35	6
Operation time
≥ 6 h	41	4	4.963	0.026
< 6 h	49	17
Cold ischemia time
≥ 8 h	45	12	0.348	0.555
< 8 h	45	9
Intraoperative blood loss
≥ 1000 mL	40	12	1.103	0.294
< 1000 mL	50	9
Intraoperative blood transfusion volume
≥ 1000 mL	37	11	0.881	0.348
< 1000 mL	53	10