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Box plots show sensitivity of 15 radiologists for easy-to-detect, moderate-to-detect, and difficult-to-detect polyps at initial qualification examination. Plus signs indicate mean value. Middle horizontal lines mark median. Top and bottom horizontal lines of boxes display interquartile range (IQR) from 25th to 75th percentiles. Whiskers are drawn to farthest observations within 1.5 IQR. Median for moderate-to-detect polyps is equal to 25th percentile because of tied values.
