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Table 2 Occupational exposure to knee-straining activities: proportion of exposed and nonexposed subjects among cases and controls

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

    Exposed Not exposed No indication
Exposure Gender Controls/cases n % n % n %
Sitting Female Controls 261 86.2 28 9.2 14 4.6
   Cases 367 83.8 60 13.7 11 2.5
  Male Controls 228 85.1 34 12.7 6 2.2
   Cases 239 79.4 53 17.6 9 3.0
Standing Female Controls 240 79.2 49 16.2 14 4.6
   Cases 363 82.9 64 14.6 11 2.5
  Male Controls 226 84.4 36 13.4 6 2.2
   Cases 249 82.7 43 14.3 9 3.0
Walking Female Controls 249 82.2 40 13.2 14 4.6
   Cases 381 87.0 46 10.5 11 2.5
  Male Controls 241 90.0 21 7.8 6 2.2
   Cases 266 88.4 26 8.6 9 3.0
Kneeling, squatting Female Controls 113 37.3 176 58.1 14 4.6
   Cases 215 49.1 212 48.4 11 2.5
  Male Controls 118 44.1 144 53.7 6 2.2
   Cases 163 54.5 129 42.5 9 3.0
Climbing stairs Female Controls 186 61.4 104 34.3 13 4.3
   Cases 317 72.4 111 25.3 10 2.3
  Male Controls 181 67.6 81 30.2 6 2.2
   Cases 220 73.1 75 24.9 6 2.0
Jumping Female Controls 46 15.3 244 80.5 13 4.2
   Cases 91 20.8 337 76.9 10 2.3
  Male Controls 79 29.5 183 68.3 6 2.2
   Cases 120 39.8 173 57.5 8 2.7
Lifting/carrying of loads Female Controls 101 32.0 144 47.5 62 20.5
   Cases 152 35.7 190 43.4 96 21.9
  Male Controls 162 60.4 87 32.5 19 7.1
   Cases 196 65.1 83 27.6 22 7.3