Table 3. Frequencies, Events, and Event Rates per 1000 Person-Years of Subsequent Clinical Fracture,a Stratified by Whether the Initial Fracture Was Traumatic or Nontraumatic and Baseline Age.
| Characteristic | Subsequent fracture by initial fracture trauma | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Traumatic | Nontraumatic | Unknown traumatic | |||||||
| No. (%) | Events | Rate per 1000 (95% CI) | No. | Events | Rate per 1000 (95% CI) | No. (%) | Events | Rate per 1000 (95% CI) | |
| All participants | 1624 (100.0) | 137 | 20.3 (17.2-24.0) | 3891 (100.1) | 398 | 27.0 (24.5-29.8) | 1627 (100.0) | 186 | 30.2 (26.2-34.9) |
| Age, y | |||||||||
| <55 | 147 (9.1) | 8 | 11.9 (5.9-23.8) | 311 (8.0) | 15 | 11.6 (7.0-19.3) | 116 (7.1) | 10 | 18.5 (9.1-34.4) |
| 55-59 | 327 (20.1) | 14 | 9.9 (5.9-16.8) | 552 (14.2) | 38 | 17.08 (12.3-23.3) | 220 (13.6) | 11 | 12.1 (6.7-21.9) |
| 60-64 | 384 (23.7) | 26 | 16.3 (11.1-23.9) | 768 (19.7) | 58 | 19.3 (14.9-25.0) | 346 (21.3) | 31 | 23.9 (16.8-34.0) |
| 65-69 | 377 (23.2) | 38 | 23.7 (17.2-32.5) | 993 (25.5) | 95 | 25.9 (21.2-31.7) | 411 (25.1) | 49 | 32.0 (24.2-42.3) |
| 70-74 | 258 (15.9) | 34 | 35.2 (25.2-49.3) | 809 (20.8) | 104 | 34.9 (28.8-42.3) | 336 (20.7) | 41 | 34.4 (25.3-46.7) |
| ≥75 | 131 (8.1) | 17 | 34.2 (21.2-55.0) | 458 (11.8) | 88 | 57.2 (46.4-70.5) | 196 (12.1) | 44 | 63.9 (47.5-95.9) |
a
Fracture sites included lower extremity (ankle, hip, patella, pelvis, shaft of femur, tibia/fibula, tibial plateau), upper extremity (carpal, elbow, lower end of humerus, radius/ulna, upper end of humerus, shaft of humerus, upper radius/ulna), and spine (lumbar spine, thoracic spine) fractures.