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Table 4 Categorisation of the cumulative life doses

From: Individual and occupational risk factors for knee osteoarthritis: results of a case-control study in Germany

  Tertile split
  First tertile Second tertile Third tertile
Smoking (package-years)    
   Female <9 9 to 20 >20
   Male <16.5 16.5 to 27 >27
Kneeling/squatting (hours/life)    
   Female <3,542 3,542 to 8,934 >8,934
   Male <3,573 3,573 to 12,243 >12,243
Sitting (hours/life)    
   Female <16,031 16,031 to 33,119 >33,119
   Male <15,180 15,180 to 34,960 >34,960
  Median split  
  Low exposure High exposure  
Lifting and carrying (tons/life)    
   Female <1,088 ≥1,088  
   Male <2,214 ≥2,214  
Sports with risk for unapparent trauma (hours/life)    
   Female <1,440 ≥1,440  
   Male <3,232 ≥3,232