Table 1 Demographic data from the different populations.

Age_(mean(SD))

61.1 (9.5)

56.5 (10.76)*

65.2 (12.6)

0.0001

Women_(N(%))

82 (78.1)

11 (13.3)*

49 (87.5)

0.0001

Smoking_(N(%))

51 (48.6)

37 (44.6)

5 (8.9)**

0.0001

Disease duration_{(median(IQR))}

12.0 (7: 20.5)

21 (9.5: 30)

/

0.002

Biological inflammation_(N(%))

70 (66.7)

36 (43.4)

/

0.004

Corticosteroid therapy_(N(%))

86 (81.9)

11 (13.25)

/

0.0001

BMI_{(median(IQR))}

26.1 (22.6: 32.4)

25.4 (23.3: 30.9)

27.4 (23.1: 37.6)

0.384

Number of spine DXA_(N(%))

104 (99)

29 (34.9)

/

0.0001

Osteoporosis on DXA (N (%))

28 (26.7)

5 (6.02)

/

0.22

Mean BMD on spine_(mean(SD))

1.07 (0.2)

1.16 (0.24)

/

0.036

Clinical osteoporosis risk factor ≥2_(N(%))

105 (100)^‡

27 (32.5)

2 (3.6)

0.0001

Calcium and/or Vitamin D_(N(%))

42 (40)^‡

18 (21.68)

4 (7.1)

0.0001

Specific treatment_(N(%))

37 (35.2)^†

13 (15.66)

0 (0)

0.002