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Table 7 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, ages 60 years over.

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 243 66.3 (0.6)   247 2.13 (0.02)  
   Questionable 65 63.9 (1.2) 0.08 66 2.04 (0.03) 0.01
   Definite 91 66.3 (1.1) 0.97 92 2.14 (0.03) 0.73
DIP       
   None 113 65.9 (0.9)   115 2.11 (0.02)  
   Questionable 166 65.3 (0.8) 0.62 169 2.11 (0.02) 0.86
   Definite 117 66.5 (0.9) 0.65 118 2.12 (0.02) 0.83
PIP       
   None 303 65.8 (0.6)   307 2.12 (0.01)  
   Questionable 88 66.7 (1.0) 0.43 90 2.12 (0.03) 0.99
   Definite 8 62.4 (3.4) 0.34 8 2.07 (0.09) 0.63
CMC/MCP       
   None 330 65.5 (0.5)   334 2.11 (0.01)  
   Questionable 32 65.6 (1.8) 0.98 33 2.07 (0.04) 0.37
   Definite 37 69.5 (1.6) 0.02 38 2.15 (0.04) 0.41
  1. a: Stiffness index values were missing for 6 women. b: metacarpal bone mineral density. * P value versus women with no joint space narrowing.