Impact of guidelines for the management of minor head injury on the utilization and diagnostic yield of CT over two decades, using natural language processing in a large dataset.

Results The yield was initially nearly 60%, but in a decreasing trend dropped below 20% when CT became routinely used for head trauma.

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Within the periods individually, we found a slightly increasing trend of yield, and during the second period, a slightly decreasing trend of yield (Fig. 3 b).

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