Table 3.

Test data. True positives (TP), false positives (FP), false negatives (FN), precision, recall, and F1 scores when assessing for accuracy of negation, with strict and relaxed matching expectations

	Matching standard	Scored items = 243
		TP	FP	FN	Precision	Recall	F1
Overall without negation	Strict	165	17	61	0.91	0.73	0.81
	Relaxed	174	17	52	0.92	0.77	0.84
Overall with negation	Strict	145	36	62	0.81	0.70	0.75
	Relaxed	152	38	53	0.80	0.75	0.77