conditional multiple logistic regression with the introduction of alcohol ( wine ) and coffee as additional variable factors to age , sex , education and social class confirmed the independent protective effect of smoking on uc ( or for internal controls = 4.2 , 95 % cl = 1.7-10.2 , or for external controls = 5.7 , 95 % cl = 2.3-14.1 ) .
C0001962
alcohol
C0043188
wine