. Author manuscript; available in PMC: 2017 Mar 6.

Published in final edited form as: Acad Emerg Med. 2016 Jan 14;23(2):171–178. doi: 10.1111/acem.12859

Table 3.

Misclassification categorization (from both test and training sets)

Misclassification Reason	Number (%)
False negatives (from 1,829 coded negative)	7 (0.4)
Decision tree misclassification	7 (100)

False positives (from 292 coded positive)	147 (50.3)
Abnormal but not PECARN TBI	53 (36.1)
Report ambiguity	12 (8.2)
Report dictation error	6 (4.1)
Text conversion error	3 (2.0)
MedLEE misread	27 (18.4)
Decision tree misclassification	46 (31.3)

MedLEE = Medical Language Extraction and Encoding; PECARN = Pediatric Emergency Care Applied Research Network; TBI = traumatic brain injury