In men with type O blood, cumulative tobacco use, high salt intake, long-term occupational dust exposure, high fat intake, alcohol consumption, and older age were all risk factors for lung cancer mortality.

• 在O型血的人中考察的癌症危险度因子有，长期吸烟，食盐量过高，在职业中长期接触粉尘，高脂肪摄入，酗酒，和年老等。