Score “0” | Absence of symptoms at different anatomical regions of the Nordic questionnaire; |
Score “1” | Symptoms reported in the previous 12 months or 7 days preceding the interview; |
Score “2” | Symptoms reported in the past 12 months and 7 days preceding the interview; |
Score “3” | Symptoms reported in the previous 7 days or preceding 12 months, with leave of absence; |
Score “4” | Symptoms reported in the past 12 months and 7 days preceding the interview, with leave of absence. |