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. 2018 Aug 7;4(3):e10188. doi: 10.2196/10188

Table 2.

Consensus population size estimates of South African female sex workers (FSWs) in the South Africa Health Monitoring Study 2013-2014.

City and method		FSW count, n	Sample proportion, p	Point estimate, N (95% CI or range)	Final estimate, n (%)^a	Plausible results, range (%)
Johannesburg
	Wisdom of the crowds	N/A^b	N/A	3000^c	7697 (0.48)	5000-10,895 (0.31-0.69)
	Unique object	1351	0.124	10,895 (582-25,018)
	Unique event	27	0.006	4500 (272-N/A)
	Service multiplier	261	0.341	765^c
	Literature	N/A	N/A	10,894
Cape Town
	Wisdom of the crowds	N/A	N/A	1500^c	6500 (0.49)	4579-9000 (0.35-0.69)
	Unique object	950	0.04	23,750^c
	Unique event	75	0.01	7500 (1380-37,500)
	Service multiplier 1	577	0.126	4579 (3153-6869)
	Service multiplier 2	398	0.156	2551 (1708-3585)
	Literature	N/A	N/A	7351
eThekwini
	Wisdom of the crowds	N/A	N/A	4000 (3000-5000)	9323 (0.77)	4000-10,000 (0.33-0.83)
	Unique object	952	0.075	11,200 (326-34,000)
	Unique event	56	0.085	747^c
	Service multiplier 1	642	0.05	12,840 (7379-33,879)
	Service multiplier 2	578	0.062	9323 (5255-17,515)
	Literature	N/A	N/A	6145

^a% adult female population.

^bN/A: not applicable.

^cImplausible estimate not used in the calculation of median preliminary population size estimate.