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Table 6 Conditional logistic regression model for men: most parsimonious model

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

  Item n tot Cases (n) Controls (n) Pvalue Odds ratio 95% confidence interval
Knee OA in relatives No (R) 367 170 197   1.00 -
  Yes 109 76 33 <0.01 2.37 1.41 to 3.98
Body mass index 18.5 to <25 kg/m2 (R) 157 48 109   1.00 -
  ≥25 to <30 kg/m2 240 133 107 <0.001 2.26 1.43 to 3.57
  ≥30 to <35 kg/m2 128 84 44 <0.001 4.00 2.30 to 6.94
  ≥35 kg/m2 40 35 5 <0.001 12.56 4.40 to 36.86
Occupation: kneeling or squatting No (R) 272 128 144   1.00 -
  Yes, <3,574 hours/life 94 48 46 NS 1.70 0.96 to 3.00
  Yes, 3,574 to 12,244 hours/life 94 55 39 <0.01 2.16 1.24 to 3.77
  Yes, >12,244 hours/life 94 61 33 <0.01 2.47 1.41 to 4.32
Sports with risk for unapparent trauma No (R) 218 109 109   1.00 -
  Yes, <3,232 hours/life 168 82 86 NS 1.57 0.98 to 2.52
  Yes, ≥3,232 hours/life 168 104 64 <0.01 2.58 1.59 to 4.17
  1. NS, not significant; (R), reference category.