Abstract
To discuss the impact of different markers on the estimation of MSM using the capture-recapture method. From March to July 2013, MSM were captured from the their related network to estimate the site of this population, under the capture-recapture method. Two different markers were set in the process of first 'capture'. The estimated numbers of MSM in Beijing were 239 258 (95% CI:48 932-429 584) and 115 731 (95% CI:78 153-153 309) when using the two markers under capture-recapture method. The estimated size of MSM population varied greatly under different markers which called for the right selection on markers when using the capture-recapture method to estimate the size of specific population.
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