Study size
Study size was based on the main aim, that is, to estimate the
prevalence of C-section among obstetricians and obstetrician’s wives or
partners in Rio de Janeiro. According to the General Medical Council,
there were 2,748 obstetricians / gynecologists in the state of Rio de
Janeiro in 2015.15 For an expected prevalence of 90%
± 5% of C-section in this population, a sample of 132 individuals would
be enough. In the most challenging scenario, that is, a prevalence of
50% ± 5%, we would need 338 participants.