TABLE 4.
Patients' clinical features by age groups at evaluation
| Age groups, year | |||||
|---|---|---|---|---|---|
| <10 | 10–15 | ≥16 | Overall | ||
| (N = 243) | (N = 136) | (N = 589) | (N = 968) | ||
| Disease stage, n (%) | Class I | 149 (61.3) | 62 (45.6) | 241 (40.9) | 452 (46.7) |
| Class II | 70 (28.8) | 55 (40.4) | 162 (27.5) | 287 (29.6) | |
| Class III | 24 (9.9) | 19 (14.0) | 186 (31.6) | 229 (23.7) | |
| Number of affected skeletal sites, n (%) | 1–5 | 95 (39.1) | 47 (34.6) | 127 (21.6) | 269 (27.8) |
| 6–10 | 92 (37.9) | 34 (25.0) | 139 (23.6) | 265 (27.4) | |
| 11–20 | 56 (23.0) | 55 (40.4) | 196 (33.3) | 307 (31.7) | |
| >20 | 0 (0) | 0 (0) | 85 (14.4) | 85 (8.8) | |
| Missing data | 0 (0) | 0 (0) | 42 (7.1) | 42 (4.3) | |
| Number of bones affected by OCs | Mean (SD) | 7 (4.06) | 8 (4.37) | 10 (5.49) | 9 (5.15) |
| Median (IQR) | 6 (4, 9) | 7 (4, 11) | 9 (5, 13) | 8 (5, 12) | |
| Number of deformities, n (%) | Without deformities | 155 (63.8) | 69 (50.7) | 277 (47.0) | 501 (51.8) |
| 1 | 29 (11.9) | 21 (15.4) | 84 (14.3) | 134 (13.8) | |
| 2 | 38 (15.6) | 17 (12.5) | 88 (14.9) | 143 (14.8) | |
| 3 | 16 (6.6) | 5 (3.7) | 44 (7.5) | 65 (6.7) | |
| 4 | 2 (0.8) | 12 (8.8) | 44 (7.5) | 58 (6.0) | |
| 5 | 1 (0.4) | 6 (4.4) | 26 (4.4) | 33 (3.4) | |
| ≥6 | 2 (0.8) | 6 (4.4) | 18 (3.1) | 26 (2.7) | |
| Missing data | 0 (0) | 0 (0) | 8 (1.4) | 8 (0.8) | |
| Deformity localizations, n (%) | Without deformity localizations | 155 (63.8) | 69 (50.7) | 277 (47.0) | 501 (51.8) |
| Lower limbs | 36 (14.8) | 29 (21.3) | 110 (18.7) | 175 (18.1) | |
| Upper limbs | 32 (13.2) | 13 (9.6) | 75 (12.7) | 120 (12.4) | |
| Both lower and upper limbs | 20 (8.2) | 25 (18.4) | 115 (19.5) | 160 (16.5) | |
| Missing data | 0 (0) | 0 (0) | 12 (2.0) | 12 (1.2) | |
| Number of functional limitations, n (%) | Without functional limitations | 219 (90.1) | 117 (86) | 398 (67.6) | 734 (75.8) |
| 1 | 18 (7.4) | 10 (7.4) | 76 (12.9) | 104 (10.7) | |
| 2 | 5 (2.1) | 7 (5.1) | 60 (10.2) | 72 (7.4) | |
| ≥3 | 1 (0.4) | 2 (1.5) | 47 (8.0) | 50 (5.2) | |
| Missing data | 0 (0) | 0 (0) | 8 (1.4) | 8 (0.8) | |
| Functional limitation localizations, n (%) | Without functional limitation localizations | 219 (90.1) | 117 (86.0) | 398 (67.6) | 734 (75.8) |
| Lower limbs | 4 (1.6) | 4 (2.9) | 89 (15.1) | 97 (10.0) | |
| Upper limbs | 19 (7.8) | 10 (7.4) | 57 (9.7) | 86 (8.9) | |
| Both lower and upper limbs | 1 (0.4) | 5 (3.7) | 37 (6.3) | 43 (4.4) | |
| Missing data | 0 (0) | 0 (0) | 8 (1.4) | 8 (0.8) | |
Abbreviations: IQR, interquartile range, 25°–75°; OC, osteochondroma(s).