The sample size was calculated according to the
previous study(7) with 80% power to test the hypothesis
and 10% data loss. A sample size of 92 women (46
cases per group) was needed to determine difference
in the prevalence of anaerobic bacteria among IUD and
non-IUD, non-hormonal users. The data were analyzed
by Statistical Program for Social Sciences (SPSS)
version 13.0. Chi square, t-test, mean, SD and
percentage were used to determine the differences
between groups as appropriate. A p-value < 0.05 was
the significance level used for all analyzes