Table 1.

Comparison of clinical data

Factor	Pulmonary infection group (n=27)	Non-pulmonary infection group (n=217)	X2 value	P value
Gender
Male	13	123	0.708	0.399
Female	14	94
Age
≥60 years old	18	80	8.873	0.003
<60 years old	9	137
BMI (kg/m2)
≥25	8	49	0.666	0.414
<25	19	168
History of drinking
Yes	6	56	0.162	0.686
No	21	161
Diabetes mellitus
Yes	15	60	8.783	0.003
No	12	157
Hypertension
Yes	10	90	0.195	0.658
No	17	127
Cardiovascular disease
Yes	11	78	0.238	0.625
No	16	139
Pulmonary diseases
Yes	6	62	0.481	0.488
No	21	155
Tumor type
Lung adenocarcinoma	16	135	1.030	0.597
Squamous cell carcinoma	8	69
Other	3	13
TNM staging
Phase I-II	12	152	7.142	0.008
Phase III-IV	15	65
Chemotherapy regimen
Single	14	60	6.656	0.010
Combined	13	157
Chemotherapy cycle
≥2	18	81	8.573	0.003
<2	9	136
Pre-chemotherapy pulmonary function (%)
≥70	17	140	0.025	0.873
<70	10	77
Post-chemotherapy white blood cell count (109/L)
≥4	12	106	0.186	0.666
<4	15	111
Post-chemotherapy albumin (g/L)
≥30	13	159	7.287	0.007
<30	14	58
Post-chemotherapy hemoglobin (g/L)
≥90	13	115	0.226	0.634
<90	14	102
Pre-chemotherapy KPS score
≥80	10	138	7.097	0.008
<80	17	79
operation time
≥180 min	12	40	9.688	0.002
<180 min	15	177
Intraoperative blood loss
≥200 mL	10	72	0.160	0.689
<200 mL	17	145

Note: BMI: Body mass index; KPS: Karnofsky performance scale; TNM: Tumor Node Metastasis.