Table 2.

Training 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 = 721
		TP	FP	FN	Precision	Recall	F1
Overall without negation	Strict	506	20	199	0.95	0.72	0.82
	Relaxed	545	17	166	0.97	0.77	0.86
Overall with negation	Strict	470	52	207	0.90	0.69	0.78
	Relaxed	508	45	175	0.92	0.74	0.82