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Table 2 Overview of electronic algorithm steps used to interpret chest radiograph reports based on rules- and probability-based strategies

From: Automated identification of pneumonia in chest radiograph reports in critically ill patients

Group (Step) Determination Rules Predicted probability
Group 1 (Step 1) Negative ‘Blanket Negative’ statement without any pneumonia-related terms  
Group 1 (Step 2) Negative No pneumonia-related terms  
Group 1 (Step 3) Possible High uncertainty pneumonia-related terms, no ‘blanket negative’ statement  
Group 1 (Step 4) Positive Low/No uncertainty pneumonia-equivalent terms, no high uncertainty pneumonia-related terms, no non-pneumonia terms  
Group 2 (Step 5) Possible High uncertainty pneumonia-related terms, no low/no uncertainty pneumonia-equivalent terms, no normal statement  
Group 2 (Step 6) Possible Infiltrate + pneumonia-related terms, no low/no uncertainty pneumonia-equivalent terms  
Group 2 (Step 7) Possible Any pneumonia-related versus terms  
Group 3 (Step 8) Positive Low/no uncertainty pneumonia-equivalent terms, no blanket normal statement  
Group 3 (Step 9) Possible Any uncertainty pneumonia-related terms  
Group 3 (Step 10) Possible Any infiltrate + pneumonia-related terms, no non-pneumonia terms  
Group 4 (Step 11) Positive   Positive > 70%
Group 4 (Step 12) Negative   Negative >30%, Possible < 30%, Positive < 10%
Group 4 (Step 13) Possible   Possible > 10%, Negative < 10%, Positive < 10%
Group 4 (Step 14) Possible   Possible > 60%, Negative < 40%
Group 4 (Step 15) Positive Any pneumonia-equivalent term  
Group 4 (Step 16) Possible   Possible > 20%, Positive > 10%
Group 4 (Step 17) Possible Any uncertainty pneumonia-related terms, no low/no uncertainty pneumonia-equivalent terms Negative < 30%
Group 4 (Step 18) Possible Pneumonia-related terms, no non-pneumonia terms, no blanket normal statement Negative < 40%
Group 4 (Step 19) Negative Non-pneumonia terms  
Group 4 (Step 20) Possible All remaining reports  
  1. Reports that are assigned an interpretation based on a step are then removed from interpretation in the subsequent steps.