Table 2.

The histopathological type of male lung cancer with smoking or non-smoking

Histopathological type#	Smoking	Non-smoking	P value*
	(n=508)	(n=1730)
Squamous cell carcinoma	127(25.0%)	850(49.1%)	<0.001
Adenocarcinoma	286(56.3%)	507(29.3%)
Large cell carcinoma	5(1.0%)	24(1.4%)
Small cell lung cancer (SCLC)	57(11.2%)	254(14.7%)
Other NSCLC	6(1.2%)	17(1.0%)
Unknown	27(5.3%)	78(4.5%)

Notes: #: Chi-square test was used. *: comparison of all histopathological types between OM group and NOM group. P<0.05 represented statistically significant.

Abbreviations: NSCLC, non-small cell lung cancer.