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Lung cancer hazard ratios by years of poorly ventilated coal use in the Shanghai Women’s Health Study. Model was adjusted for age (continuous), education (elementary, middle, high, college), environmental tobacco (yes, no), family history of lung cancer (yes, no), history of non-malignant lung disease (yes, no), occupation (technical/professional, government/political, administrative, manufacturing), vegetable oil use (yes/no). Test for non-linearity = 0.97.
