Table 2 Absolute differences and agreement between self-reported and measured BMI in participants with and without OA
From: The validity of self-reported body mass index in a population-based osteoarthritis study
Participants with clinical | Participants without clinical | P-value | |
|---|---|---|---|
OA (n = 449) | OA (n = 151) | ||
Normalweight (<25 kg/m2) | |||
Difference between measured and self-reported BMI, mean (SD) | 0.64 (0.93) | -0.00 (1.49) | 0.000 |
Poor agreement, n (%) | 3 (2.4) | 2 (4.3) | |
Close agreement, n (%) | 42 (33.3) | 16 (34.0) | |
Exact agreement, n (%) | 81 (64.3) | 29 (61.7) | 0.754 |
Overweight (25–29.99 kg/m2) | |||
Difference between measured and self-reported BMI, mean (SD) | 1.20 (1.60) | 1.05 (1.14) | 0.256 |
Poor agreement, n (%) | 18 (10.8) | 3 (4.8) | |
Close agreement, n (%) | 89 (53.6) | 35 (56.5) | |
Exact agreement, n (%) | 59 (35.5) | 24 (38.7) | 0.406 |
Obese (≥30 kg/m2) | |||
Difference between measured and self-reported BMI, mean (SD) | 2.07 (1.95) | 1.26 (1.31) | 0.006 |
Poor agreement, n (%) | 44 (28.0) | 3 (7.1) | |
Close agreement, n (%) | 81 (51.6) | 27 (64.3) | |
Exact agreement, n (%) | 32 (20.4) | 12 (28.6) | 0.010 |