Table 2.

Population size estimates of female sex workers by study site and population size estimation method (we use “Acceptable bounds” here as an umbrella term as some methods report 95% CIs, other methods report plausibility bounds, and the respondent-driven sampling adjusted reverse tracking method reports 95% simulation intervals).

Study site and population size estimates method		Estimated number of FSWsa (acceptable bounds)	Estimated percentage of adult (15 to 49 years) female population who are FSWs (acceptable bounds)
Windhoek
	Stakeholder consensusb	3000 (1800-3400)	2.2 (2.0-3.6)
	Reverse tracking method	492 (418-565)	0.56 (0.48-0.64)
	RadRc	1552 (1101-2387)	1.77 (1.25-2.72)
Katima Mulilo
	Stakeholder consensus	800 (380-2,000)	8.6 (4.1-21.5)
	Reverse tracking method	192 (181-203)	2.06 (1.95-2.18)
	RadR	453 (336-656)	4.85 (3.60-7.03)

^aFSWs: female sex workers.

^bThe stakeholder consensus was informed by the following population size estimates methods: key informant interview, unique object multiplier, wisdom of the crowd, and literature review.

^cRadR: respondent-driven sampling adjusted reverse tracking method.