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 |