Table 4.

Prevalence of spinal and femoral neck osteoporosis and spine bone mineral density (Sbmd) and femoral neck bone mineral density (Fnbmd) in the four age groups.

	AgeGp1  ≤ 40 y (n = 51)	AgeGp2 41–50 y (n = 183)	AgeGp3 51–60 y (n = 171)	AgeGp4  > 60 y (n = 77)
Age	37.4 ± 0.39	45.9 ± 0.20	54.6 ± 0.21	64.6 ± 0.33
		Gp2 v Gp1, Gp3, Gp4 (< 0.001, < 0.001, < 0.001	Gp3 v Gp1, Gp4 (< 0.001, < 0.001)	Gp4 v Gp1 (< 0.001)
SOstGp1	40	141	113	59
SOstGp2	1 (2.0%)	6 (3.3%)	5 (2.9%)	2 (2.6%)
FnOstGp1	33	97	80	31
FnOstGp2	3 (5.9%)	10 (5.5%)	21 (12.3%)	7 (9.1%)
	Gp2 v Gp3 (0.041)
Sbmd	1.067 ± 0.022	1.059 ± 0.011	1.026 ± 0.012	1.100 ± 0.019
	NS	Gp3 v Gp4 (0.008)
Fnbmd	0.862 ± 0.016	0.881 ± 0.008	0.839 ± 0.009	0.819 ± 0.015
	Gp2 v Gp3, Gp4 (0.011, 0.009)

SOstGp1 & FnOstGp1 = groups with normal spine and femoral neck (T-scores ≥ − 1.00).

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

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

Comparisons of Sbmd and Fnbmd among the 4 age groups were carried out using the multilinear regression analysis with, METmin, BMI, PBF as covariates.