Relationship between childhood thyroid cancer incidence, radiation thyroid dose and nitrate in groundwater in Belarus.

a Intercept-only model.b Likelihood-ratio chi-square test of the current model fit comparing to an empty model.c Significance of the regression coefficient associated with a given predictor in the current model, Wald chi-square test.d A multiplicative interaction term between radiation dose and nitrate concentration.Relationship between childhood thyroid cancer incidence, radiation thyroid dose and nitrate in groundwater in Belarus.