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.