Standard practice in the removal of wisdom teeth in the chair involves a primary

Question

Standard practice in the removal of wisdom teeth in the chair involves a primary anaesthetic and a supplementary anaesthetic. A dentist carried out a large study comparing patients randomly assigned to have either the primary anaesthetic only (P) or both anaesthetics (B) The outcome was the use of strong pain relief in the four hours after surgery (yes or no The difference between the percentages (P minus B) using strong pain relief was 396, with a 9596 confidence interval of (-496 to 1196) The P-value for a test of no true difference in the percentages was o.5 Which of the following could be included in an appropriate summary of the study? (Tick as many as apply.) he confidence interval suggests at most about 11 more people need strong pain relief if the supplementary anaesthetic s not used. The estimated difference in percentages is small, so the supplementary anaesthetic is not of great benefit. The result is consistent with no true difference in the percentages, as P = 0.5 As the P-value is large, there is no need for the supplementary anesthetic.

Explanation / Answer

The results of the experiment suggests that the difference between the percentages in pain relief using primary anaesthetic (P) over both primary and supplementary anaesthetic is 4%. The 95% confidence interval is from -4 to 11%. The p value was found to be 0.5.

Therefore, the results suggest that there is no true difference in percentage as p is 0.5. As p value is large, there is no need for supplementary anaesthetic (options 3 and 4).

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