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Table 1 Performance of the natural language processing (NLP) method in various kinds of data sources

From: Detecting inpatient falls by using natural language processing of electronic medical records

Data sources Results of NLP analysis Fall-positive Fall-negative Total Sensitivity (Recall) PPV (Precision) Specificity F-measure
  Positive 223 3,351 3,574     
Progress notes Negative 0 209,064 209,064 1.00 0.06 0.98 0.12
  Total 223 212,415 212,638     
  Positive 52 0 52     
Incident reports Negative 0 476 476 1.00 1.00 1.00 1.00
  Total 52 476 528     
  Positive 10 0 10     
Image order entries Negative 2 19,672 19,674 0.83 1.00 1.00 0.91
  Total 12 19,672 19,684     
  Positive 2 13 15     
Discharge summaries Negative 0 1,149 1,149 1.00 0.13 0.99 0.24
  Total 2 1,162 1,164     
  1. PPV means positive predictive value.