Table 2 Characteristics of bone mineral density measurements and low-impact fractures, according to each BMI category
From: Could obesity be considered as risk factor for non-vertebral low-impact fractures?
BMI category | Total N = 6182 | Underweight N = 73 | Normal weight N = 1902 | Overweight N = 2377 | Obesity N = 1830 | P |
|---|---|---|---|---|---|---|
Spine and femur BMD (n, %) | < 0.001 | |||||
 Normal | 1316 (21.3) | 3 (4.1) | 244 (12.8) | 473 (19.9) | 596 (32.6) |  |
 Osteopenia | 2745 (44.4) | 21 (28.8) | 764 (40.2) | 1106 (46.5) | 854 (46.6) | |
 Osteoporosis | 2121 (34.3) | 49 (67.1) | 894 (47.0) | 798 (33.6) | 380 (20.8) | |
T-score | ||||||
 Lumbar Spine | −1.49 (± 1.45) | −2.66 (± 1.40) | −1.89 (± 1.38) | −1.50 (± 1.37) | − 1.07 (± 1.46) | < 0.001 |
 Femoral neck | −1.54 (± 1.16) | −2.62 (± 1.25) | − 1.93 (± 1.12) | − 1.53 (± 1.07) | −1.11 (± 1.14) | < 0.001 |
 Total femur | −0.80 (± 1.23) | −2.18 (± 1.12) | −1.37 (± 1.14) | −0.78 (± 1.08) | − 0.17 (± 1.18) | < 0.001 |
BMD (g/cm2) | ||||||
 Lumbar Spine | 1.000 (± 0.17) | 0.859 (± 0.17) | 0.952 (± 0.16) | 0.999 (± 0.16) | 1.059 (± 0.17) | < 0.001 |
 Femoral neck | 0.849 (± 0.15) | 0.717 (± 0.14) | 0.801 (± 0.14) | 0.851 (± 0.14) | 0.902 (± 0.14) | < 0.001 |
 Total femur | 0.910 (± 0.17) | 0.746 (± 0.14) | 0.843 (± 0.19) | 0.911 (± 0.14) | 0.985 (± 0.14) | < 0.001 |
Low-impact Fx (n, %) | 756 (12.2) | 10 (13.7) | 234 (12.3) | 280 (11.8) | 232 (12.7) | 0.81 |
Fracture sites (n, %)b | 0.09 | |||||
 LL | 276 (36.5) | 2 (20.0) | 76 (32.5) | 108 (38.6) | 90 (38.8) |  |
 UL | 318 (42.1) | 7 (70.0) | 97 (41.4) | 118 (42.1) | 96 (41.4) | |
 Spine | 53 (7.0) | 0 (0.0) | 15 (6.4) | 18 (6.4) | 20 (8.6) | |
 Hip | 46 (6.1) | 0 (0.0) | 17 (7.3) | 21 (7.5) | 8 (3.4) | |
 Others | 63 (8.3) | 1 (10.0) | 29 (12.4) | 15 (5.4) | 18 (7.8) | |