A Case-control Study of Nasopharyngeal Carcinoma in the High Background Radiation Areas of Yangjiang, China

0.7 to 2.1), and alcohol consumption (OR = 0.9, 95% CI = 0.5 to 1.9) were not significantly related to NPC risk. The ORs of NPC risk comparing HBRA and a nearby control area before and after adjustment for the major risk determinants identified in the present study were 0.86 (95% CI = 0.50 to1.50) and 0.87 (95% CI = 0.45 to1.67), respectively. Salted fish intake was a strong risk factor of NPC. Education, the history of