Table 1.

Country-specific population demographics and modeling estimates shown for Lesotho, Malawi, Rwanda and Ghana.

	Lesotho	Malawi	Rwanda	Ghana
Total population sizea	2 067 000	15 263 000	9 998 000	23 837 000
Proportion 15–49 yearsb	44.0%	40.9%	44.7%	45.5%
Population 15–49 years	910 000	6 243 000	4 469 000	10 846 000
Number of individuals classified by couple serostatus (×103)
Total in couples	364–637	2497–4370	1788–3128	4338–7592
Concordant negative	243–426	2077–3634	1718–3007	4158–7276
Concordant postive	71–124	176–309	30–53	40–69
Discordant	49–87	234–426	39–68	140–245
Male positive	33–57	141–246	25–43	73–127
Female positive	17–29	103–180	14–25	68–118
Total number of HIV infections per year in discordant couples  Infections	2470–4323	12 161–21 281	1940–3394	7006–12 261

Estimates for the number of individuals classified by couples serostatus (multiplied by 1000), are calculated using the model and assuming 40% (shown by the low end of the range) or 70% (shown by the high end of the range) of the population are in stable couples; stable couples include concordant positive, concordant negative and discordant.

^aWorld Health Organization country profiles (19).

^bMeasure Demographic and Health Surveys (20).