One of the most common statistical tests in  the medical journals is chi-
   square test. The present study compares the used chi-square tests in the
   medical journals with chi-square for trend.

          The statistical package of EPI6 was used to compare the methods.
   For some selected papers chi-square test and chi-square test for trend
   were used.

          The results showed in some tests although the chi-square test was
   statistically significant but the chi-square for trend was not significant and
   vice versus.

          It can be concluded when analyzing contingency tables, care should
   be taken for the appropriate test.