Association between quartiles of choline intake and lung cancer risk.

a<p>Adjusted for sex, race/ethnicity, age (continuous), smoking status, total caloric intake.</p>b<p>Adjusted for sex, race/ethnicity, age, pack-years, total caloric intake, family cancer history, dust exposure, second-hand smoke, emphysema, hay fever, smoking status, asthma, addiction index, alcohol, time since smoking cessation.</p>c<p>Adjusted for sex, race/ethnicity, age (continuous), total caloric intake.</p>d<p>Adjusted for sex, race/ethnicity, age, pack-years, total caloric intake, family cancer history, dust exposure, second-hand smoke, emphysema, hay fever, asthma, addiction index, alcohol, time since smoking cessation.</p>*<p>p-value, chi-square test using quartiles of choline intake as categorical variable.</p>**<p>p-value, test for linear trend using quartiles of choline intake as continuous variable.