[Risk factors of lung cancer in Tianjin]

To investigate the risk factors of lung cancer in Tianjin and to provide evidence for further monitor there of.

A case-control study involving interviews with 193 new cases and 259 controls aged 30 - 76 years was carried out. Structured questionnaires were used to collect information on general condition, living environment, living style, disease and family history, etc. Logistic regression model univariate and multivariate analysis were used to pick out the significant lung cancer risk factors.

By monovariate analysis, risk factors such as smoking, passive smoking, drinking, history of malignancy in family and occupation were found. By multivariate analysis, smoking, passive smoking, higher body mass index (BMI) and average income and living space per capita ten years earlier were ascertained, their operations research (OR) values were 3.302, 1.193, 1.003, 1.067 and 0.913.

Smoking and passive smoking are independent risk factors of lung cancer. Monthly income per person and living space per person 10 years earlier are associated with elevated risk of lung cancer. Higher body mass index has protective effects on lung cancer risk.