Skip to main content

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)
  1. BMD bone mineral density BMI: body mass index Fx fracture LL lower limbs UL upper limbs BMD bone mineral density; P values are those of Student’s t test for means or the chi-square test for proportions; Kruskal-Wallis test