Chinese never smokers with adenocarcinoma of the lung are younger and have fewer lymph node metastases than smokers

Table 4 Logistic regression analysis of lymph node metastasis in adenocarcinoma patients

Independent variables	OR	95% CI of OR		P value
Independent variables	OR	Upper	Lower	P value
Smoking Status	2.70	5.31	1.39	0.0035
Age at diagnosis	1.02	1.04	0.99	0.07
Tumor size	3.81*	5.34	2.74	2.3 × 10^− 15
Gender(Male)	0.94	1.73	0.50	0.9750

*tumor size was regarded as a numeric variable, OR was calculated for each 1-stage increase in tumor size

ISSN: 1465-993X