Table 1.

Population size estimates, female-to-male transgender adults (transmen), San Francisco, 2015.

Area	Method	Source	Count	% in survey (n = 122)	Population size estimate	Uncertainty estimates
San Francisco (city and county)	Service multiplier
		Service provider #1	83	8.2%	1012	371–1656a
		Service provider #2	140	12.3%	1138	581–1698a
		Service provider #3	75	22.1%	339	205–476a
		Municipal STD clinic	16	5.7%	281	37–526a
	Wisdom of the crowds	Survey, median response	NA	NA	600	150–20,000b
	Literature	Census, Flores report	717,884	0.76% (0.42–1.31%) [7]	5456 /2 = 2728	1507–4702c
Median					806
San Francisco Bay Area	Multiplier
		Private physician practice	345	5.7%	6053	1637–10,470a
		Community event	288	14.8%	1946	1087–2806a
	Wisdom of the crowds	Survey, median response	NA	NA	2000	40–96,000b
	Literature	Census, Flores report	Total adults = 5,867,054	0.76% (0.42–1.31%) [7]	44,590/2 = 22,294	1230–38,429c
Median					4027

NA not applicable

^a95% confidence intervals

^b2.5 and 97.5 percentiles of responses

^cCalculated using published credible intervals [7]