Table 2 Outcomes, depicted as median, mean, and 95 % CI of the mean. (not adjusted for age, muscle area, time since menopause, and duration of RA)

Cortical CSA (mm²) at 33 % of femur

40

314.43

323.22

308.72-337.73

20

298.61

296.43

284.70-308.17

0.043

Cortical thickness in mm at 33 % of the femur

40

4.209

4.285

4.054-4.517

20

4.017

3.886

3.597-4.174

0.076

Medullary CSA (mm²) at 33 % of femur

40

180.40

191.66

172.82-210.49

20

196.68

227.65

177.84-277.45

0.466

Medullary CSA in relation to total CSA (%)

40

29.47

29.62

27.48-31.77

20

31.06

33.71

29.49-37.92

0.113

Cortical vBMD (mg/cm³) at 33 % of femur

40

1061.86

1062.03

1046.9-1077.1

20

1067.86

1036.03

994.02-1078.05

0.562

Total bone CSA (mm²) at 33 % of femur

40

623.11

639.91

613.87-665.94

20

643.31

649.58

586.36-712.81

0.925

Femoral index (%)

40

29.791

30.279

28.406-32.12

20

28.897

27.769

24.672-30.865

0.227

Polar SSI (mm3)

40

2640.840

2590.723

2411.798- 2769.648

20

2321.920

2277.980

2008.614- 2547.347

0.082