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This sample size was decided based on saturation method.
The sample size was decided based on resource availability.
A priori sample size was decided after reviewing the literature.
The sample size was decided in keeping with the intention to gain an in-depth insight into provider views and perceptions [ 22].
First, the sample size was decided based on feasibility rather than formal calculations; the limited sample size may, therefore, compromise generalizability of the results.
The sample size was decided using a power calculation of 95% confidence intervals (CI) and 80% power based on the assumption that there would be at least 15% decrease in the prevalence of STIs among CSWs since the previous survey.
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There is also recent research on adaptive Simon's two-stage designs [ 17] where the second stage sample size is decided at the end of stage 1 based on observed responses.
For IPS1 and IPS2, the sample size of was decided to be 5,336.
To achieve this sample size it was decided to mail the questionnaire to 235 general surgeons, nearly three times more than needed.
A 5% significance level was used for inclusion and exclusion of factors throughout; due to the large sample size it was decided that terms which were not significant at this level would not be important.
To increase the sample size, it was decided to also include in the study patients from the IKSR with a history of more than 2 clinical stone events and a documented stone episode after January 1 , 2002
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