Table 1 . The difference noted between the Z- and T-scores in units of SD stratified by age, sex, and skeletal sites.

			Male				Female
		<0.5	0.5- <1	>=1		<0.5	0.5- <1	>=1
Age category(year)	Skeletal sites	n(%)	n(%)	n(%)		n(%)	n(%)	n(%)
20-29	Femoral neck	341(86)	57(14)	0(0)		415(89)	50(11)	2(0)
	Trochanter	208(71)	86(29)	1(0)		303(96)	11(4)	0(0)
	Total hip	377(98)	9(2)	0(0)		441(98)	9(2)	0(0)
	Lumbar spine	392(99)	5(1)	0(0)		389(84)	72(16)	0(0)
30-39	Femoral neck	318(100)	0	0(0)		337(63)	187(35)	13(2)
	Trochanter	192(95)	10(5)	0(0)		317(89)	38(11)	1(0)
	Total hip	302(100)	1(0)	0(0)		477(94)	32(6)	0(0)
	Lumbar spine	306(97)	11(3)	0(0)		521(100)	0(0)	0(0)
40-49	Femoral neck	309(88)	44(12)	0(0)		86(16)	347(63)	116(21)
	Trochanter	216(100)	0(0)	0(0)		218(62)	132(37)	4(1)
	Total hip	334(100)	0(0)	0(0)		238(45)	289(55)	2(0)
	Lumbar spine	256(73)	93(27)	0(0)		167(31)	375(69)	1(0)