Self-administered instrument that consists of 65 items describing feelings; to them should be assigned values from 0 to 4 according to the Likert scale of 5 points (0 -no, 1 - a little, 2 - more or less, 3 - well, 4 - extremely). The POMS aims to evaluate six factors: tension-anxiety (9 items), depression-dejection (15 items), anger-hostility (12 items), vigor-activity (8 items), fatigue-inertia (7 items), confusion-bewilderment (7 items), and a total mood disturbance score (TMD)