Association between quartiles of choline intake and lung cancer risk.

aAdjusted for sex, race/ethnicity, age (continuous), smoking status, total caloric intake.bAdjusted 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.cAdjusted for sex, race/ethnicity, age (continuous), total caloric intake.dAdjusted 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-value, chi-square test using quartiles of choline intake as categorical variable.**p-value, test for linear trend using quartiles of choline intake as continuous variable.