Table 1 Data for the 141 JIA patients longitudinally evaluated in comparison to their respective control groups

Number of subjects

245

166

80

82

Female/male ratio

172:73

132:34

58:22

59:23

Age, years (range)

15.6 (9.6 - 28.3)

17.1 (11.0 - 28.9)

14.8 (8.9 - 26.7)

16.9 (10.9 - 28.4)

Height, z score

−0.6 ± 1.1

−0.5 ± 0.9

−0.1 ± 0.9

−0.1 ± 0.7

BMI, z score

−0.3 ± 0.8

−0.1 ± 0.6

0.1 ± 0.7

0.2 ± 0.5

Disease duration

5.6 ± 3.2 years

7.2 ± 4.3 years

-

-

C-HAQ DI

0.74 ± 0.63

0.59 ± 0.48

-

-

DXA examination

 BMC, g

45.17 ± 19.13^a

49.04 ± 21.56°°°^j

51.23 ± 17.90

56.98 ± 16.82^h

 BMAD spine, g/cm²

−0.64 ± 0.80^b

−0.49 ± 1.10°°°

0.24 ± 0.21

0.13 ± 0.32

HR-pQCT

 TrbBMD (mg/cm³)

179.5 ± 34.6^c

181.9 ± 48.8^f

217.7 ± 26.3

244.9 ± 28.5ⁱ

 CBA (mm²)

136.3 ± 122. ^c

149.0 ± 87.6^f

209.2 ± 101.3

214.3 ± 74.3

 CrtBMD (mg/cm³)

1,050.2 ± 126.5

1,079.8 ± 82.1^j

1,039.6 ± 79.3

1,078.3 ± 73.1^g

 Muscle CSA (mm²)

2,112.7 ± 732.4^b

2,083.7 ± 697.8^f

2,398.5 ± 773.3

2,579.3 ± 794.5^h

 Fat CSA (mm²)

1,143.1 ± 649.1^c

1,110.1 ± 483.7^e

918.3 ± 382.1

945.8 ± 394.2

 SSIp (mm³)

246.3 ± 140.2^a

306.8 ± 250.7^d,j

284.0 ± 127.9

276.7 ± 110.4

Ultrasonography

 -AD-SoS

1,994.5 ± 119.7^b

2,003.0 ± 101.1^e

2,122.3 ± 113.1

2,152.8 ± 118.9

 -QUS z score

−0.6 ± 1.8^a

−0.5 ± 1.5^e

0.1 ± 1.6

0.2 ± 1.8