Table 1.
Runner characteristics and prevalence of hip and/or knee pain and arthritis
| Demographic Characteristics | All Marathoners | Pain a | Arthritis b | ||
|---|---|---|---|---|---|
| Yes | No | Yes | No | ||
| n = 3804 | n = 1383 (36.4%) | n = 2421 (63.6%) | n = 277 (7.3%) | n = 3527 (92.7%) | |
| Age c | 43.9 ± 11.4 (18-83) | 42.3 ± 11.5 (18-77)* | 44.7 ± 11.2 (18-83) | 51.7 ± 10.8 (25-75)** | 43.2 ± 11.2 (18-83) |
| Sex d | |||||
| Male | 1984 (52.2) | 615 (44.5)* | 1369 (56.6) | 160 (57.8) | 1824 (51.7) |
| Female | 1816 (47.7) | 766 (55.4)* | 1050 (43.4) | 117 (42.2) | 1699 (48.2) |
| Prefer not to say | 4 (0.1) | 2 (0.1)* | 2 (0.1) | 0 (0.0) | 4 (0.0) |
| BMI, kg/m2 c | 23.8 ± 3.5 (15.5-42.6) | 24.0 ± 3.6 (16.2-42.6) | 23.7 ± 3.4 (15.5-42.3) | 24.5 ± 3.6 (17.3-36.6)** | 23.8 ± 3.5 (15.5-42.6) |
| No. of marathons c e | 9.5 ± 18.6 (1-664) | 7.5 ± 10.8 (1-120)* | 10.7 ± 21.7 (1-664) | 13.4 ± 20.2 (1-172)** | 9.2 ± 18.4 (1-664) |
| Duration of running, y c | 14.7 ± 11.0 (1-67) | 14.0 ± 10.3 (1-55)* | 15.2 ± 11.3 (1-67) | 19.4 ± 12.8 (1-55)** | 14.4 ± 10.7 (1-67) |
| Mileage, miles/week c | 27.9 ± 15.5 (0-180) | 25.7 ± 14.2 (0-130)* | 29.2 ± 16.0 (0-180) | 26.6 ± 14.3 (0-85) | 28.0 ± 15.5 (0-180) |
| Pace for training runs, average ± SD, minutes:seconds/mile | 8:52 ± 1:38 | 9:02 ± 1:42* | 8:46 ± 1:34 | 9:12 ± 1:45 | 8:50 ± 1:37 |
| Family history of hip/knee arthritis d | 993 (26.1) | 408 (29.5)* | 585 (24.2) | 123 (44.4)** | 870 (24.7) |
| History of hip/knee injury that prevented running d | 1892 (49.7) | 948 (68.6)* | 944 (39.0) | 238 (85.9)** | 1654 (46.9) |
| History of hip/knee surgery d | 413 (10.9) | 210 (15.2)* | 203 (8.4) | 130 (46.9)** | 283 (8.0) |
| Hip | 43 (1.1) | 27 (2.0) | 16 (0.7) | 13 (4.7) | 30 (0.9) |
| Knee | 370 (9.7) | 183 (13.2) | 187 (7.7) | 117 (42.2) | 253 (7.2) |
| Cross-train d | 2873 (75.5) | 1050 (75.9) | 1823 (75.3) | 214 (77.3) | 2659 (75.4) |
| Participate in other sports d | 1470 (38.6) | 532 (38.5) | 938 (38.7) | 107 (38.6) | 1363 (38.6) |
BMI, body mass index.
a
History of hip and/or knee pain within the past year that prevented running.
b
History of hip and/or knee arthritis.
c
Values are given as mean and SD, with range in parentheses.
d
Values are given as number of runners, with percentage in parentheses.
e
Includes ultramarathon distance events.
*
P < 0.05 compared with patients without hip/knee pain.
**
P < 0.05 compared with patients without hip/knee arthritis.