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Table 1 Distribution of cases and controls

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

    Age at inclusion in study (years) Age used for exposure analysis (years)
  Gender n Mean Standard deviation Mean Standard deviation
Cases Female 438 62.0 9.6 59.6 9.8
  Male 301 60.0 11.1 57.1 11.2
Controls Female 303 57.8 11.8 54.8 11.8
  Male 268 53.9 12.7 50.9 12.7