I have a data set consisting of ~10,000 patients. Each patient answered how often they had chocolate and we assigned the following values to their responses: Never= 0* 1-6 time per year = 0.01* 7-11 times per year = 0.028* 1 time per month = 0.033* 2-3 times per month = 0.08* 1 time per week = 0.14* 2 times per week = 0.29* 3-4 times per week = 0.5* 5-6 times per week = 0.79* 1 time per day = 1* 2 or more times per day = 2* We also have data describing the levels of a certain cytokine in their blood.* The question I am trying to answer is: Does the amount of chocolate someone eats cause DECREASED levels of this cytokine? What statistical test should I run in order to answer this question? I am very new to statistics, so any and all information is much appreciated.