Table 1. Frequencies, Events, and Event Rates per 1000 Person-Years of Initial and Subsequent Clinical Fracture,a Stratified by Age and Race/Ethnicity.
| Characteristic | Fracture outcome | |||||
|---|---|---|---|---|---|---|
| Initial fracture | Subsequent fracture | |||||
| No. (%) | Events | Rate per 1000 (95% CI) | No. (%) | Events | Rate per 1000 (95% CI) | |
| All participants | 66 874 (100) | 7142 | 13.9 (13.6-14.3) | 7142 (100) | 721 | 26.1 (24.3-28.1) |
| Age, y | ||||||
| <55 | 7713 (11.5) | 574 | 9.0 (8.3-9.7) | 574 (8.0) | 33 | 13.2 (9.4-18.5) |
| 55-59 | 13 695 (20.5) | 1101 | 10.0 (9.4-10.6) | 1101 (15.4) | 63 | 13.8 (10.8-17.7) |
| 60-64 | 16 440 (24.6) | 1498 | 11.9 (11.3-12.6) | 1498 (21.0) | 115 | 19.5 (16.2-23.4) |
| 65-69 | 14 876 (22.2) | 1781 | 16.0 (15.3-16.8) | 1781 | 182 | 26.7 (23.1-30.9) |
| 70-74 | 9859 (14.7) | 1403 | 19.6 (18.6-20.6) | 1403 (19.6) | 179 | 34.9 (30.1-40.4) |
| ≥75 | 4291 (6.4) | 785 | 26.6 (24.8-28.6) | 785 (11.0) | 149 | 54.7 (46.6-64.2) |
| Race/ethnicity | ||||||
| White | 54 131 (80.9) | 6392 | 15.4 (15.1-15.8) | 6392 (89.5) | 678 | 27.5 (25.5-29.7) |
| African American | 7111 (10.6) | 331 | 5.9 (5.3-6.6) | 331 (4.6) | 14 | 10.6 (6.3-17.9) |
| Hispanic | 2900 (4.3) | 191 | 8.8 (7.6-10.1) | 191 (2.7) | 14 | 19.0 (11.2-32.0) |
| Other/unknown | 2732 (4.1) | 228 | 11.1 (9.7-12.6) | 228 (3.2) | 15 | 16.2 (9.8-26.9) |
| American Indian/Alaska Native | 370 (0.6) | 29 | 10.6 (7.3-15.2) | 29 (0.4) | 2 | 16.7 (4.2-66.8) |
| Asian/Pacific Islander | 1469 (2.2) | 106 | 9.5 (7.8-11.5) | 106 (1.5) | 7 | 15.0 (7.1-31.4) |
| Unknown | 893 (1.3) | 93 | 14.1 (11.5-17.2) | 93 (1.3) | 6 | 17.8 (8.0-39.6) |
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.