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Table 4 Age and body mass index adjusted means (SEM) of bone mass (stiffness indexa and mBMDb) by joint space narrowing status 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

Joint space narrowing status No. Stiffness indexa P value* No. mBMDb P value*
Knee       
   None 374 70.6 (0.5)   381 2.24 (0.01)  
   Questionable 85 67.8 (1.1) 0.02 87 2.17 (0.03) 0.02
   Definite 98 70.3 (1.1) 0.84 99 2.27 (0.03) 0.31
DIP       
   None 214 70.6 (0.7)   219 2.24 (0.02)  
   Questionable 214 69.1 (0.7) 0.14 217 2.22 (0.02) 0.37
   Definite 126 70.8 (0.9) 0.90 128 2.25 (0.03) 0.71
PIP       
   None 442 70.1 (0.5)   450 2.23 (0.01)  
   Questionable 107 70.3 (1.0) 0.89 109 2.23 (0.02) 0.99
   Definite 8 67.1 (3.6) 0.40 8 2.19 (0.09) 0.66
CMC/MCP       
   None 480 69.8 (0.4)   488 2.23 (0.01)  
   Questionable 36 70.4 (1.7) 0.74 37 2.18 (0.04) 0.21
   Definite 41 73.4 (1.6) 0.03 42 2.26 (0.04) 0.49
  1. a: Stiffness index values were missing for 10 women. b: metacarpal bone mineral density. * P value versus women with no joint space narrowing.