Table 1.

Characteristics of the Study Participants and Prevalence of HIV-1 Antibody

				HIV-1 antibody positive (%)
Groups	n	Male/female	Mean age (SD)	Current study	Study in 2007a
IDU	302	302/0	32.5 (8.5)	26.8%*	35.9% (n=760)*
FSW	284	0/284	28.0 (8.2)	13.4%**	23.1% (n=91)**
Blood donors	206	182/24	29.1 (8.3)	0.5%	2.9% (n=210)
Pregnant women	166	0/166	26.1 (5.4)	0.6%	0.5% (n=200)
Total	958	484/474	29.0 (8.2)	n=121

^aIshizaki et al.⁴

^*p=0.006; ^**p=0.041.

IDU, injecting drug users; FSW, female sex workers.