Factors associated with risk of PE included the average number of patients per one doctor (OR = 1.01; 95% CI 1.00 - 1.01), patients from 17 - 59 years old (OR = 3.25; 95% CI 1.22 - 8.66), the number of prescribed drugs > 5 (OR = 3, 38; 95% CI: 2, 33 - 4, 89), doctors with 6 - 10 years of experience (OR = 2.50; 95% CI 1.57 - 3.98), doctors with more than 10 years of experience (OR = 2.16; 95% CI 1.38 - 3.36) and surgical wards (OR = 2.08; 95% CI 1.41-3.05).