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. 2024 Mar 18;16(3):e56397. doi: 10.7759/cureus.56397

Table 8. Number needed to scan for low and high pre-test probability patients.

CT, computed tomography; NGT, nasogastric tube

  Pre-test probability
  High (81%) Low (19%)
Low pre-test probability (deciding order CT)   ~6
High pre-test probability (deciding to place NGT pre-CT) ~1.3