Table 4.

Prevalence of low bone mass (low QUS values), depended on different cutoff values of T-score, in Asian female populations

Age stratum (y)	Present study		Japan*		Korea, Taiwan, and Vietnam
	T-score -2.5	T-score -1.0	T-score -2.5	T-score -1.0	T-score -2.5	T-score -1.0
40–49	6.7	38.4	0.7	32.1	ND	ND
50–59	16.5	52.5	5.2	64.8	ND	ND
60–69	41.0	79.1	18.7	88.7	ND	ND
70–79	58.6	88.0	43.6	95.2	ND	ND
≥50	37.5	72.0	ND	ND	11.8,† 20.0‡	26.8,‡ 56.0§
≥60	50.9	84.1	ND	ND	46.0,† 50.6‡	61.8‡

ND = no data.

*In Japan, 12,201 women aged 40 years or older were screened with Achilles, Lunar ultrasonometry at the calcaneus. Healthy subjects were aged 20–29 years [11].

^†In South Korea, 552 women older than 50 years underwent Achilles, Lunar ultrasonometry at the calcaneus. Healthy subjects were aged 20–29 years [12].

^‡In three Taiwanese communities, 2631 men and 3691 women aged 31 years or older were selected for UBIS-3000 ultrasonometry at the calcaneus. Healthy subjects were aged 31–40 years [13].

^§In Vietnam, 668 men and 1390 women aged 18 years or older underwent QUS-II ultrasonometry at the calcaneus. Age of peak BUA was estimated to be 27 and 32 years in men and women, respectively [14].