When all these significant parameters were entered into a multivariable model, only three remained statistically significant: eating disorders and excessive exercise decreased the chance for higher prolactin levels (OR 0.206, p = 0.040 and OR 0.280, p = 0.031, respectively), whereas a higher TSH was predictive for higher prolactin levels (OR 1.923, p = 0.020). This evidence concerns the gene PRL and eating disorder.