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. Author manuscript; available in PMC: 2015 Aug 28.

Published in final edited form as: Arthritis Care Res (Hoboken). 2014 Nov;66(11):1612–1618. doi: 10.1002/acr.22328

Table 3.

Muscle CSA and muscle density Z scores in RA subjects and healthy controls stratified by measures of adiposity (tertile of fat CSA or BMI)^*

	RA patients		Controls		P
	Mean ± SD	N	Mean ± SD	N	P
Muscle CSA Z score
Fat CSA Z score tertile
1	−1.39 ± 1.18	12	−0.25 ± 0.98	159	0.0002
2	−0.52 ± 0.95	14	0.052 ± 0.99	157	0.04
3	0.24 ± 1.05	20	0.21 ± 0.99	151	0.9
Muscle density Z score
BMI Z score tertile
1	−0.63 ± 0.80	13	0.20 ± 0.74	159	0.0002
2	−0.67 ± 0.96	11	0.12 ± 0.74	160	0.001
3	−0.50 ± 0.74	22	−0.35 ± 0.86	145	0.4

^*

CSA = cross-sectional area; RA = rheumatoid arthritis; BMI = body mass index.