Table 3. Multinomial regression results for potential doping behavior (PDB) with negative PDB as reference value - variables derived from Questionnaire of Substance Use (OR – Odds Ratio; CI – Confidence Interval. POSITIVE PDB OR (95%CI) NEUTRAL PDB OR (95%CI) AGE CONT 1.20 (0.93-1.56) 1.01 (0.76-1.33) EXPERIENCE IN SWIMMING CONT 0.97 (0.78-1.19) 0.98 (0.81-1.19) COMPETITIVE RESULTS IN NON-OLYMPIC DISCIPLINES CONT 0.73 (0.26-2.08) 0.69 (0.27-1.78) COMPETITIVE RESULTS IN OLYMPIC DISCIPLINES CONT 0.59 (0.21-1.71) 0.41 (0.17-0.98) OPINION ABOUT DOPING PRESENCE IN SWIMMING No, I don’t think doping is used 0.13 (0.01-1.15) 0.49 (0.01-1.84) I don’t know - Not sure 0.53 (0.13-2.09) 0.25 (0.07-1.05) Occurs, but rarely/Doping is common REF REF NUMBER OF DOPING TESTING Never tested on doping 0.99 (0.11-5.11) 0.98 (0.10-5.81) Once or twice 0.98 (0.22-2.81) 0.97 (0.24-3.01) Three times and more REF REF CONT – indicates variables considered as continuous for the purpose of regression calculation; REF – reference value