Table 2.

Volumetric bone mineral density (vBMD), bone mineral content (BMC), and bone geometric characteristics assessed by peripheral quantitative computed tomography. Data are mean ± SD.

Measure	RA Group	Control Group	p	p^*
4% site (trabecular)
BMC, mg	83.80 ± 20.01	98.3 ± 14.56	0.001	0.001
vBMD, mg/cm³	175.84 ± 40.77	208.37 ± 26.59	0.001	0.001
CSA, mm²	479.38 ± 59.22	474.45 ± 58.56	0.632	0.292
38% site
Cortical BMC, mg	249.46 ± 42.15	269.27 ± 30.75	0.002	0.026
Cortical vBMD, mg/cm³	1113.83 ± 39.59	1125.39 ± 33.55	0.066	0.039
Cortical CSA, mm²	223.66 ± 36.03	239.28 ± 26.36	0.004	0.090
CRTHK, mm	4.099 ± 0.66	4.444 ± 0.48	0.001	0.009
PERI, mm	67.61 ± 3.47	67.99 ± 4.25	0.583	0.760
ENDO, mm	41.859 ± 4.60	40.068 ± 5.40	0.046	0.035
14% site
Total BMC, mg	193.62 ± 35.10	218.35 ± 21.38	0.001	0.017
Total vBMD, mg/cm³	407.155 ± 83.24	468.25 ± 70.89	0.001	0.01
Total CSA, mm²	483.03 ± 69.54	475.6 ± 78.12	0.57	0.44
Trabecular BMC, mg	19.38 ± 10.30	26.25 ± 8.83	0.001	0.004
Trabecular vBMD, mg/cm³	91.07 ± 48.73	125.96 ± 47.83	0.001	0.005
Tabecular CSA, mm²	217.25 ± 31.29	213.9 ± 35.16	0.57	0.44
Cortical BMC, mg	149.74 ± 30.80	169.50 ± 20.32	0.001	0.004
Cortical vBMD, mg/cm³	931.16 ± 73.74	968.96 ± 53.29	0.001	0.007
Cortical CSA, mm²	159.96 ± 26.6	174.75 ± 16.97	0.001	0.003
SSIp, mm³	1147.32 ± 235.89	1256.41 ± 221.7	0.007	0.123
66% site
Muscle area, mm²	5263.77 ± 957.65	5851.59 ± 772.67	0.001	NA

↵* Analysis of covariance, adjusted for muscle area. CSA: cross-sectional area; CRTHK: cortical thickness; PERI: periosteal circumference; ENDO: endocortical circumference; SSIp: polar stress strength index; NA: not applicable.