Table 6.

Prevalence of spine and femoral neck osteoporosis and spine bone mineral density (Sbmd) and femoral neck bone mineral density (Fnbmd) in the three OB groups.

	OBGp1 (PBF ≤ 20%) (n = 352)	OBGp2 (PBF > 20–25%) (n = 111)	OBGp3 (PBF > 25%) (n = 19)
SOstGp1	269	72	12
SOstGp2	11 (3.1%)	3 (2.7%)	0 (0%)
FnOstGp1	185	48	8
FnOstGp2	28 (8.0%)	11 (9.9%)	2 (10.5%)
Sbmd	1.086 + 0.009	0.978 + 0.016	0.963 + 0.036
Gp1 v Gp2, Gp3 (< 0.001, 0.003)
Fnbmd	0.880 + 0.007	0.795 + 0.011	0.808 + 0.026
Gp1 v Gp2, Gp3 (< 0.001, 0.028)

SOstGp1 & FnOstGp1 = groups with normal spine and hip bone density, (T-scores ≥ − 1.00).

SOstGp2 & FnOstGp2 = groups with osteoporosis of spine and femoral neck (T-scores < − 2.5).

Osteoporosis prevalence was tested for significance using the Fisher Exact Test.

Comparisons of Sbmd and Fnbmd among the 3 OB groups were carried out using the multilinear regression analysis with, age, METmin, BMI as covariates.