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

Table 5 Age and body mass index adjusted means (SEM) of bone mass (stiffness index^a and mBMD^b) by osteoarthritis (OA) grade at the knee, distal interphalangeal (DIP), proximal interphalangeal (PIP), carpometacarpal/metacarpophalangeal (CMC/MCP) joints, ages 60 years over.

OA grades	No.	Stiffness index^a	P value*	No.	mBMD^b	P value*
Knee
0	151	65.8 (0.8)		154	2.14 (0.02)
1	82	65.8 (1.1)	0.99	83	2.06 (0.03)	0.03
2	88	66.7 (1.0)	0.50	89	2.11 (0.03)	0.48
3	65	66.3 (1.3)	0.75	66	2.14 (0.03)	0.90
4	13	59.5 (2.8)	0.03	13	2.03 (0.07)	0.16
		Test for trend	0.71		Test for trend	0.89
DIP
0	50	65.8 (1.4)		51	2.11 (0.04)
1	61	64.9 (1.3)	0.61	61	2.07 (0.03)	0.37
2	174	66.0 (0.7)	0.93	178	2.13 (0.02)	0.68
3	52	65.6 (1.4)	0.90	52	2.09 (0.03)	0.69
4	62	67.0 (1.2)	0.54	63	2.14 (0.03)	0.48
		Test for trend	0.43		Test for trend	0.29
PIP
0	227	66.0 (0.7)		231	2.11 (0.02)
1	85	65.8 (1.1)	0.90	86	2.15 (0.03)	0.17
2	79	66.2 (1.1)	0.89	80	2.10 (0.03)	0.73
3	5	58.9 (4.4)	0.11	5	2.14 (0.11)	0.75
4	3	68.2 (5.6)	0.70	3	1.95 (0.14)	0.28
		Test for trend	0.80		Test for trend	0.73
CMC/MCP
0	278	65.9 (0.6)		282	2.12 (0.01)
1	40	62.5 (1.5)	0.04	41	2.04 (0.04)	0.06
2	49	66.3 (1.4)	0.79	49	2.13 (0.04)	0.86
3	29	70.0 (1.8)	0.03	30	2.16 (0.05)	0.40
4	3	68.5 (5.6)	0.63	3	2.16 (0.14)	0.79
		Test for trend	0.16		Test for trend	0.64

a: Stiffness index values were missing for 6 women. b: metacarpal bone mineral density. *P value versus women with no OA.

ISSN: 1471-2474