Health Questions and Answers

What does a P value refer to?

The probability that the results of a study or the differences between study subsets occurred by chance. The most commonly used value, P < 0.05, means that there is less than a 5% probability that the study results occurred by chance. This is statistically significant, but not necessarily clinically significant. In an emergency room  decrease by 1 minute in overall length of stay may be statistically significant (P < 0.05), but a 1-minute reduction in overall length of stay likely has no clinical relevance for physicians.

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