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

Table 2 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.

OA grades	No.	Stiffness index^a	P value*	No.	mBMD^b	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

a: Stiffness index values were missing for 10 women. b: metacarpal bone mineral density. *P value versus women with no OA.

ISSN: 1471-2474