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Table 1 Demographic characteristics of participants

From: Prevalence and risk factors for bone loss in Southern Chinese with rheumatic diseases

 

HC

RA

Pa

OA

Pa

SLE

Pa

SSc

Pa

N = 302

N = 559

 

N = 198

 

N = 206

 

N = 53

 

Age, years, median [IQR]

63.0 [53.2;72.8]

58.0 [50.0;66.0]

< 0.001

61.0 [53.0;69.8]

0.188

45.0 [35.0;54.0]

< 0.001

54.0 [45.0;59.0]

< 0.001

Disease durationb, years, median [IQR]

NA

5.6 [2.0;12.0]

NA

4.0 [1.5;10.0]

NA

3.0 [1.0;7.0]

NA

3.5 [2.0;7.0]

NA

Age groups, years, n(%)

  

< 0.001

 

0.008

 

< 0.001

 

0.019

  < 30

19 (6.3)

10 (1.8)

 

2 (1.0)

 

37 (18.0)

 

2 (3.8)

 

 31–39

9 (3.0)

24 (4.2)

 

4 (2.0)

 

38 (18.4)

 

5 (9.4)

 

 40–49

25 (8.3)

105 (18.8)

 

29 (14.6)

 

50 (24.3)

 

10 (18.9)

 

  ≥ 50

249 (82.5)

420 (75.1)

 

163 (82.3)

 

81 (39.3)

 

36 (67.9)

 

BMI, Kg/m2, mean (SD)

22.5 (3.7)

21.9 (3.5)

0.321

24.1 (4.0)

< 0.001

22.0 (3.6)

0.085

21.8 (3.0)

0.935

Gender, female, n(%)

229 (75.8)

450 (80.5)

0.173

165 (83.3)

0.087

187 (90.8)

< 0.001

38 (71.7)

0.676

Menopause status of female, n(%)

  

0.01

 

0.277

 

< 0.001

 

0.067

 Post-menopause

202 (88.2)

359 (79.8)

 

139 (84.2)

 

91 (48.7)

 

29 (76.3)

 

 Early menopause, age ≤ 45

31 (15.3)

48 (13.4)

 

18 (12.9)

 

18 (19.8)

 

4 (13.8)

 
 

HC

AS

Pa

pSS

Pa

Gout

Pa

MCTD

Pa

 

N = 302

N = 128

 

N = 98

 

N = 111

 

N = 45

 

Age, years, median [IQR]

63.0 [53.2;72.8]

36.5 [27.0;45.2]

< 0.001

54.5 [46.0;60.0]

< 0.001

61.0 [48.0;72.0]

0.269

56.0 [46.0;62.0]

< 0.001

Disease durationb, years, median [IQR]

NA

6.5 [3.0;12.0]

NA

1.2 [0.6;2.3]

NA

6.0 [3.0;11.5]

NA

1.3 [0.5;4.5]

NA

Age groups, years, n(%)

  

< 0.001

 

0.003

 

0.006

 

0.003

  < 30

19 (6.3)

42 (32.8)

 

5 (5.1)

 

5 (4.5)

 

2 (4.4%)

 

 31–39

9 (3.0)

30 (23.4)

 

10 (10.2)

 

7 (6.31)

 

2 (4.4)

 

 40–49

25 (8.3)

36 (28.1)

 

17 (17.3)

 

22 (19.8)

 

13 (28.9)

 

  ≥ 50

249 (82.5)

20 (15.6)

 

66 (67.3)

 

77 (69.4)

 

28 (62.2)

 

BMI, Kg/m2, mean (SD)

22.5 (3.7)

22.0 (4.2)

0.865

21.3 (2.9)

0.094

24.1 (3.3)

0.003

21.6 (3.0)

0.79

Gender, female, n(%)

229 (75.8)

40 (31.2)

< 0.001

91 (92.9)

0.001

18 (16.2)

< 0.001

39 (86.7)

0.197

Menopause status of female, n(%)

  

< 0.001

 

0.001

 

0.734

 

0.001

 Post-menopause

202 (88.2)

9 (22.5)

 

66 (72.5)

 

17 (94.4)

 

26 (66.7)

 

 Early menopause, age ≤ 45

31 (15.3)

3 (33.3)

 

5 (7.6)

 

5 (29.4)

 

7 (26.9)

 
  1. aCompared with healthy controls. b:correlated with age
  2. HC healthy controls, RA rheumatoid arthritis, OA osteoarthritis, SLE systemic lupus erythematosus, SSc systemic scleroderma, AS ankylosing spondylitis, pSS primary Sjogren syndrome, MCTD mixed connective tissue disease