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Table 2 Age and body mass index adjusted means (SEM) of bone mass (stiffness indexa and mBMDb) by osteoarthritis (OA) grade at the knee, distal interphalangeal (DIP), proximal interphalangeal (PIP), carpometacarpal/metacarpophalangeal (CMC/MCP) joints.

From: Appendicular bone mass and knee and hand osteoarthritis in Japanese women: a cross-sectional study

OA grades No. Stiffness indexa P value* No. mBMDb P value*
Knee       
   0 261 70.7 (0.7)   267 2.25 (0.02)  
   1 110 69.7 (1.0) 0.40 112 2.20 (0.02) 0.09
   2 103 69.8 (1.0) 0.46 104 2.21 (0.02) 0.20
   3 69 70.5 (1.3) 0.90 70 2.28 (0.03) 0.44
   4 14 63.3 (2.7) 0.01 14 2.16 (0.07) 0.22
   Test for trend 0.18   Test for trend 0.63
DIP       
   0 122 71.2 (1.0)   125 2.25 (0.02)  
   1 98 70.0 (1.0) 0.36 98 2.20 (0.03) 0.11
   2 214 69.3 (0.7) 0.11 219 2.23 (0.02) 0.43
   3 59 69.5 (1.3) 0.30 59 2.23 (0.03) 0.52
   4 64 71.5 (1.3) 0.87 66 2.27 (0.03) 0.69
   Test for trend 0.82   Test for trend 0.65
PIP       
   0 355 70.5 (0.5)   363 2.23 (0.01)  
   1 106 69.1 (1.0) 0.24 107 2.27 (0.02) 0.14
   2 88 70.0 (1.1) 0.73 89 2.22 (0.03) 0.73
   3 5 63.6 (4.5) 0.13 5 2.27 (0.11) 0.72
   4 3 72.7 (5.8) 0.70 3 2.08 (0.14) 0.29
   Test for trend 0.39   Test for trend 0.91
CMC/MCP       
   0 420 70.1 (0.5)   428 2.24 (0.01)  
   1 47 67.6 (1.5) 0.11 48 2.16 (0.04) 0.05
   2 55 69.8 (1.4) 0.84 55 2.25 (0.03) 0.80
   3 32 73.9 (1.8) 0.04 33 2.26 (0.04) 0.58
   4 3 72.9 (5.8) 0.63 3 2.26 (0.14) 0.86
   Test for trend 0.26   Test for trend 0.80
  1. a: Stiffness index values were missing for 10 women. b: metacarpal bone mineral density. *P value versus women with no OA.