Table 1.

Differences of the parameters among UI low or high subgroups

	NSAIDs UI
	No. of the patients	Low	High	P
Age (y)				0.463
< 60	157	72	85
≥ 60	116	59	57
Sex				0.070
Male	136	73	63
Female	137	58	79
Type of resection				0.001*
Lobectomy	208	112	96
Segmentectomy	65	19	46
Pathology				0.181
ADC	252	117	135
SCC	14	10	4
Others	7	4	3
Smoking status				0.143
Never	195	88	107
Current + former	78	43	35
Alcohol status				0.608
Never	182	85	97
Current + former	91	46	45
Comorbidity				0.580
With	69	31	38
Without	204	100	104
T stages				0.686
T1 + T2	267	129	138
T3 + T4	6	2	4
N stages				< 0.001*
N0	241	106	135
N1 + N2	32	25	7
TNM stages				0.004*
I	237	105	132
II	22	17	5
III	14	9	5

UI use intensity, NSAIDs non-steroid anti-inflammatory drugs, ADC adenocarcinoma, SCC squamous carcinoma

^*With significant difference