Figure 1

Selenium level and colorectal cancer risk. The relationship between selenium concentration in blood serum and the risk of colorectal cancer is displayed in form of odds ratios at each of the selenium level, separately for Patients from Estonia (in red) and Poland (in blue). The odds ratios are calculated for sliding windows of 30 selenium values each. The multiple regression model "lowess" is represented as a continuous line separately for each country. The reference baseline odds ratio of 1 has been added as a dotted black line.