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$$a= 28,\ b= 129$$ $$c= 4, \ c=133$$

$$Relative\ Risk = 7.2170542635659$$ $$95\%\ CI = 2.4624324910492\ To\ 21.15220312946$$ $$Significance\ Level = 0.00034151751415447$$

The odds ratio (OR), its standard error and 95% confidence interval are calculated according to Altman, 1991. The odds ratio is given by $$OR={\frac {\frac {a}{b}}{\frac {c}{d}}}$$ $$={\frac {a*d}{b*c}}$$

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A chances proportion (OR) is a proportion of the relationship between openness and a result. The OR speaks to the chances that a result will happen given a specific openness, contrasted with the chances of the result happening without that openness. Chances proportions are most regularly utilized in the event that control contemplates, anyway, they can likewise be utilized in cross-sectional and accomplice study plans too (for certain adjustments and additionally suspicions).

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