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09% in 2009 to 5.05% in 2013 (trend test, pselleck products followed by chest (10.01%), miscellaneous (5.86%) and spine (1.45%). Contrast-enhanced CTs were ordered in more than half of the ED visits (63.21%). There was a significant annual increase in the utilisation of head, abdomen, chest and miscellaneous CT scans in the ED in our study (trend test, p based on CT type (2009 as reference). Table?3 Types of computed tomography utilization and contrast medium use Among the three age groups, the greatest number of CT scans ordered by ED physicians was for patients aged ��65?years. All age groups showed a Alectinib mouse steady annual increase in ED CT utilisation rates (trend test, p The annual trend of association between ED CT utilisation and subsequent admission rate is delineated in figure 3. In all, 68?216 ED patients were subsequently admitted, including those admitted Tryptophan synthase to the ICU. Although the overall rate of ED CT utilisation had markedly increased during the 5-year period (11.1% in 2009 to 17.7% in 2013), the subsequent admission rate among ED visits with CT utilisation did not increase accordingly, but, rather, declined from 59.9% in 2009 to 48.2% in 2013. Pearson's correlation analysis was conducted to examine the relationship between the annual ED CT utilisation rate and the subsequent admission rate after ED CT utilisation, and it showed a strongly negative correlation between the two trends (r=?0.778, p