Table 2.
Subject characteristics according to BMI category
| Normal weight (n=87) |
Overweight (n=87) |
Obesity (n=87) |
P-valuec | |
|---|---|---|---|---|
| BMI, mean ± SD kg/m2 | 22.76 ± 1.62 | 27.33 ± 1.40 | 33.03 ± 2.29 | <0.001b |
| Age, mean ± SD years | 55.64 ± 7.17 | 56.56 ± 8.67 | 57.72 ± 8.04 | 0.23b |
| Males (Percent) | 39 (44.83%) | 46 (52.87%) | 40 (45.98%) | 0.52a |
| History of knee injuryd (Percent) | 36 (41.38%) | 25 (28.74%) | 31 (35.63%) | 0.22a |
| History of knee surgerye (Percent) | 12 (13.79%) | 19 (21.84%) | 18 (20.69%) | 0.34a |
| Knee Kellgren-Lawrence scores | 0.97a | |||
| Grade 0 (Percent) | 57 (65.52%) | 53 (60.92%) | 52 (59.77%) | |
| Grade 1 (Percent) | 13 (14.94%) | 17 (19.54%) | 18 (20.69%) | |
| Grade 2 (Percent) | 12 (13.79%) | 11 (12.64%) | 12 (13.79%) | |
| Grade 3 (Percent) | 5 (5.75%) | 6 (6.90) | 5 (5.75) | |
| Racial composition | 0.90a | |||
| White or Caucasian (Percent) | 69 (79.31%) | 70 (80.46%) | 68 (78.16%) | |
| Black or African American (Percent) | 14 (16.09%) | 14 (16.09%) | 17 (19.54%) | |
| Other non-white (Percent) | 4 (4.60%) | 3 (3.45%) | 2 (2.30%) | |
| Total WOMAC knee pain, mean ± SD | 1.52 ± 2.60 | 2.43 ± 3.29 | 1.71 ± 2.53 | 0.08b |
a
Pearson’s chi-squared test
b
Linear regression analysis
c
Significant values are in bold (p value < 0.05)
d
History of knee injury causing difficult to walk for at least one week
e
History of other types of knee surgery (all subjects with arthroscopy excluded)
BMI, body mass index; WOMAC, Western Ontario and McMasters Osteoarthritis Index