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Method Relevant questions were inserted into the questionnaires given to two behavioural surveillance groupsβfemale attendees of sexually transmitted disease STD clinics and FSWs. This accounted for 3. Little attention has been paid to the size of this population. The key issue in using this method is to find two sources of information that overlap in a certain way.
This provided a good opportunity for such estimation. Methods and study design Principle of the multiplier method The basic principle of this method is that the number of people belonging to the population being estimated who appear at selected institutions or services during a certain time period is equal to the total size of the estimated population multiplied by the proportion of the population who attended the selected institutions or services during the same time period.
In Guiyang, two criteria were considered during the selection process: selected clinics should be located in different parts of the city and the average number of female clients should not be too small. A quarter of these clinics were then selected from each subgroup to provide the Guiyang sample. Those who had exchanged sex for money in the past 3 months were defined as sex workers.
The number of female STD attendees m during 3 or 6 months 3 months in Xingyi, but 6 months in Guiyang, given its relatively large FSW population, which were consistent with the time periods used in the surveys among FSWs when they were asked whether they attended the selected clinics was determined according to the medical records of the clinics.
A list of the STD clinics that were selected for use in the survey of female STD attendees was highlighted on the FSW questionnaires by including the names and addresses of the clinics and the names of doctors.