Table 1 Characteristics and disease variables in JDM patients and controls
|  | All participants | Age < 20y | Age ≥ 20y | |||
|---|---|---|---|---|---|---|
Patients (n = 59)a | Controls (n = 59)a | Patients (n = 28) | Controls n = 28 | Patients (n = 31) | Controls n = 31 | |
Age, y, median (range) | 21.5 (6.7–55.4) | 21.6 (6.2–55.4) | 15.3 (6.7–19.8) | 14.4 (6.2–20.1) | 34.3 (20.4–55.4) | 34.2 (20.5–55.4) |
Female, n (%) | 36 (61) | 36 (61) | 20 (71.4) | 20 (71.4) | 16 (51.6) | 16 (51.6) |
BMI, kg/m2, mean (SD) | 22.3 (4.8) | 22.7 (4.5) | NA | NA | 24.0 (4.4) | 23.8 (3.5) |
Weight, kg, mean (SD) | 62.6 (20.1) | 65.5 (20.1) | 52.0 (19.5) | 57.0 (22.7) | 72.1 (15.7) | 73.2 (13.6) |
Height, cm, mean (SD) | 164.9 (14.7)†| 167.3 (15.8) | 157.1 (15.9) | 159.8 (18.3) | 171.8 (9.1) | 174.0 (9.2) |
Disease duration, y, median (IQR) | 16.8 (6.6–27.0) | NA | 6.5 (4.9–8.7) | NA | 26.3 (18.9–31.0) | NA |
Time from diagnosis to medication, month, median (IQR) | 4 (2.0–6.25) | NA | 4 (1.8–6.3) | NA | 4 (2.0–7.5) | NA |
Fracture any, n (%) | 19 (32.2) | 21 (36.8) | 7 (25.0) | 7 (25.0) | 21 (67.7) | 14 (48.3) |
PRINTO inactive, n (%) | 21 (35.6) | NA | 9 (32.1) | NA | 12 (38.7) | NA |
DAS (0–20) at follow up, median (IQR) | 5 (3.0–6.0) | NA | 5 (2.2–6.0) | NA | 4.5 (3.0–7.0) | NA |
DAS at diagnosis (0–20), median (IQR) | 13.0 (9.0–15.0) | NA | 13.0 (9.6–15.0) | NA | 13.0 (9.0–16.0) | NA |
MDI total (0–40) at follow up, median (IQR) | 3 (2–6) | NA | 2 (1–4) | NA | 5 (3–8) | NA |
MDI osteoporosis, n (%) | 5 (8.5) | NA | 2 (7.1) | NA | 3 (9.7) | NA |
Smoking daily, n (%) | 11 (18.6) | 8 (13.6) | 3 (10.7) | 2 (7.1) | 8 (13.6) | 6 (19.1) |
SF 36 physical component score ≥ 20y, median (IQR) | NA | NA | NA | NA | 52.2 (42.4–57.7)†| 56.5 (52.8–59.6) |
Exercise ≥2 h/week ≥20y, n (%) | NA | NA | NA | NA | 19 (61.3) | 20 (64.5) |
Exercise ≥2 activities/week ≥20 y, n (%) | NA | NA | NA | NA | 14 (45.2) | 19 (61.3) |