The chi-square assumption means at least five observations must be in every cell of the 2x2 table
The unadjusted odds ratio with 95% confidence interval is still the primary inference, regardless of using a chi-square or Fisher's Exact test. The p-value yielded from the statistical tests is not interpreted due to the lack of precision and accuracy in measurement and sampling error, especially with smaller sample sizes. The width of the 95% confidence interval determines the precision and accuracy of the inference yielded from these statistics.
Chi-square assumption and applied statistics
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