title: A study on methods of estimating the population size of men who have sex with men in Southwest China.
abstract: OBJECTIVE
  To ascertain practical methods of estimating the population size of men who have sex with men (MSM) by field application.
  
  
  METHODS
  Nine public places were selected, where men who have sex with men (MSM) frequented. Capture-recapture method and multiplier method were used to count the number of men who have sex with men (MSM) in the assigned places in 10 days.
  
  
  RESULTS
  The population size estimated using multiplier method counted 877. Three estimates produced by capture-recapture method were 1408 (95% CI: 1116-1908), 1207 (95% CI: 932-1712) and 949 (95% CI: 757-1272), respectively.
  
  
  CONCLUSIONS
  Multiplier method was easy and smooth in practice and produced highly reliable results, which yet was expensive. The application of capture-recapture method cost less in both time and funds, and the three results produced could verify each other, which was fit for the estimation.
authors.affiliation: Department of Epidemiology, West China School of Public Health, Sichuan University, Chengdu, Sichuan, PR China.
authors.forename: Rongsheng
authors.initials: R
authors.lastname: Luan
authors.forename: Gang
authors.initials: G
authors.lastname: Zeng
authors.forename: Dapeng
authors.initials: D
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: Luo
authors.forename: Ping
authors.initials: P
authors.lastname: Yuan
authors.forename: Boheng
authors.initials: B
authors.lastname: Liang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Li
mesh_terms: D002681:China / Q000453:epidemiology; D003625:Data Collection / Q000379:methods*; D003627:Data Interpretation, Statistical; D003710:Demography; D018451:Homosexuality, Male / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D015233:Models, Statistical; D011156:Population Density; D011159:Population Surveillance / Q000379:methods*; D011633:Public Facilities