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) |  |