. Author manuscript; available in PMC: 2016 Mar 9.

Published in final edited form as: Sex Transm Infect. 2013 Aug;89(5):366–371. doi: 10.1136/sextrans-2013-051071

Table 1.

Population size estimates of MSM, FSW and IDU using service multipliers, Nairobi, November 2010

Population (n)	Service	a. Number of clients or one-time visits	b. Per cent who reported visiting (%)^*	Population size calculation a/b
MSM (563)	Cohort study participation	250	2.4	10417
	Sex worker health clinic	150	4.6	3261
	Peer education programme 1	400	1.8	22222
	Peer education programme 2	140	1.2	11667
FSW (465)	HIV testing site	1634	3.0	54467
	Sex worker study cohort clinic	331	2.0	16550
	Peer education outreach programme	4543	0.7	649000
IDU (352)	HIV and STD service clinic	250	1.1	22727
	IDU cohort assessment site	53	0.4	13251
	IDU-friendly drop-in centre HIV testing data	893	17.75	5031
	IDU-friendly drop-in centre attendance data	1526	27.0	5652

RDS-adjusted proportion.

FSW, female sex workers; IDU, intravenous drug users; MSM, men who have sex with men; RDS, respondent-driven sampling.