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Table 1 Classification for simultaneous exposure to 2 ergonomic risk factors

From: Relationship between simultaneous exposure to ergonomic risk factors and work-related lower back pain: a cross-sectional study based on the fourth Korean working conditions survey

  Ergonomic risk factors A
Never Mild Moderate Severe
Ergonomic risk factors B Never 1. Little exposure to A, B 2. Usually exposed to A
Moderate 3. Usually exposed to B 4. High exposure to A, B