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Question Researchers evaluated the effectiveness of early abdominopelvic computed tomography in patients with acute abdominal pain of unknown cause. A randomised controlled trial study design was used. The intervention was early computed tomography (within 24 hours of admission). The control treatment was standard practice (radiological investigations as indicated). In total, 55 patients were randomised to early computed tomography and 55 to control treatment. The main outcome measures included length of hospital stay. The distribution of length of hospital stay was positively skewed. The logarithm function was used to transform the observations, and the Student’st test was then used to compare the treatment groups. The length of hospital stay for the standard practice group was on average 1.1 days longer than that in the early computed tomography group (geometric mean 6.4 days (range 1 to 60) versus 5.3 days (1 to 31). The ratio of geometric means (standard treatment versus early c
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