Biostatistics Series Module 4: Comparing Groups - Categorical Variables.

As an example consider the following data pertaining to individuals at high risk of renal calculi: A χ 2 for trend analysis with this data returns a χ 2 trend value of 49.70 which at df = 1 yields P < 0.001, indicating that the increasing trend in stone proportion with age is statistically highly significant and likely to be true.

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Thus, we can interpret these results as a significant trend in stone proportion increase with age, overall as also separately for males and females.

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