Skip to main content

Table 5 Conditional logistic regression model for women: 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 pain during childhood No (R) 623 361 262   1.00 -
  Yes 59 41 18 <0.05 2.08 1.01 to 4.26
Knee OA in relatives No (R) 408 216 192   1.00 -
  Yes 205 142 63 <0.001 2.17 1.40 to 3.37
Malalignment of the knee No (R) 624 336 288   1.00 -
  Yes 90 83 7 <0.001 11.54 4.65 to 28.66
Body mass index 18.5 to <25 kg/m2 (R) 255 97 158   1.00 -
  ≥25 to <30 kg/m2 249 163 86 <0.001 3.21 2.09 to 4.96
  ≥30 to <35 kg/m2 149 107 42 <0.001 3.55 2.12 to 5.94
  ≥35 to <40 kg/m2 55 49 6 <0.001 11.58 4.38 to 30.63
  ≥40 kg/m2 23 20 3 <0.001 17.65 4.50 to 69.23
Smoking No (R) 391 255 136   1.00 -
  Yes, <9 package-years 117 63 54 NS 0.69 0.40 to 1.17
  Yes, 9 to 20 package-years 114 64 50 NS 1.16 0.67 to 2.03
  Yes, >20 package-years 115 54 61 <0.01 0.43 0.26 to 0.73
Occupation: kneeling or squatting No (R) 388 212 176   1.00 -
  Yes, <3,542 hours/life 109 62 47 NS 1.50 0.83 to 2.69
  Yes, 3,542 to 8,934 hours/life 110 68 42 NS 1.36 0.78 to 2.37
  Yes, >8,934 hours/life 109 85 24 <0.01 2.52 1.35 to 4.68
Occupation: sitting No (R) 88 60 28   1.00 -
  Yes, <16,032 hours/life 209 127 82 NS 0.72 0.37 to 1.40
  Yes, 16,032 to 33,119 hours/life 209 122 87 <0.05 0.51 0.26 to 0.99
  Yes, >33,119 hours/life 210 118 92 <0.01 0.39 0.20 to 0.76
Occupation: lifting and carrying No (R) 263 139 124   1.00 -
  sometimes 65 37 28 NS 0.88 0.44 to 1.77
  Yes, <1,088 tons/life 122 69 53 NS 0.69 0.38 to 1.24
  Yes, ≥1,088 tons/life 121 92 29 <0.01 2.13 1.14 to 3.98
Sports with risk for unapparent trauma No (R) 570 342 228   1.00 -
  Yes, <1,440 hours/life 81 41 40 NS 0.92 0.48 to 1.75
  Yes, ≥1,440 hours/life 78 50 28 <0.01 2.47 1.31 to 4.65
  1. NS, not significant; (R), reference category.