differences between two groups. 12 patients in the group
of metformin and 10 patients in the group of placebo
were single. According to Fisher exact test, there was no
statistical difference in marital status between two groups.
Five patients in the group of metformin and eight patients
in the group of placebo were smokers. The Chi-square test
demonstrated no statistical differences between two groups.
Evaluation of educational level between two groups was
done using a Fisher exact test that showed no statistical
difference between two groups. The above findings suggest
that gender, marital status, smoking, and educational level
are equal in both groups and does not influence the results.
These are illustrated in Table 1.