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For our survey, we used an MM questionnaire, developed by the
Swedish co-author. This questionnaire is easy to complete (A4 size sheet, only two pages)
and has been widely used in field surveys in Scandinavian countries. Andersson K. Epidemiological approach to indoor air problems. Indoor Air 1998;suppl 4:32-9. We defined for analysis that weekly occurring symptom was positive, and subjects who had positive answer in at least one general symptom and in at least one symptom of the mucous membrane were regarded as having SBS. |