EXam Menu Question # 2 of 20 Following is the results of a study comparing the e

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EXam Menu Question # 2 of 20 Following is the results of a study comparing the effects of arthroscopic surgery vs physical therapy on lower extremity function in patients with moderately severe knee meniscus tears. 80 subjects were randomly assigned to receive either surgery or PT. The Lower Extremity Function Scale (LEFS) was used to assess LE function. A higher score on the LEFS is better. For the surgical group, the mean and standard deviation for the LEFS at 8-wks post-surgery:was 29 ± 8.2pts. For the PT group, the mean and standard deviation at 8-wks was 36-4.6pts, 95% Confidence Interval for the difference between the means for the two groups was 2.8 to 8.9 The results indicate that Answers A-D A Surgery and PT are equally effective in improving LE Function B Surgery is more effective than PT in improving LE Function 95% of the time PT will result in greater improvements in the L 8.9 compared to surgery E Function test score ranging from 2.8 to D We cannot be confident in the results of this study 2/20

Explanation / Answer

The 95% confidence interval here states that the difference between the means of the 2 variables, has the interpretation that there is a 0.95 probability that the difference in the means would lie between 2.8 and 8.9.

Therefore this means that 95% of the time PT will result in greater improvements in the LE function test score ranging from 2.8 to 8.9 compared to surgery.

Therefore c) is the correct answer here.

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