Table 2.

Extraction performance.

Event type	Argument	Train-CV				Test
		# Gold	P	R	F1	# Gold	P	R	F1
COVID	Trigger	3,931	0.95	0.97	0.96	1,497	0.96	0.97	0.97
	Assertion	2,936	0.70	0.74	0.72	1,075	0.72	0.74	0.73
	Test Status	1,068	0.60	0.62	0.61	457	0.63	0.60	0.62
Symptom	Trigger	13,823	0.82	0.85	0.83	5,789	0.81	0.85	0.83
	Assertion	13,833	0.77	0.79	0.78	5,791	0.77	0.80	0.79
	Change	739	0.45	0.03	0.06	341	0.45	0.05	0.09
	Severity	743	0.47	0.30	0.37	327	0.45	0.31	0.37
	Anatomy	3,839	0.76	0.59	0.66	1,959	0.78	0.50	0.61
	Characteristics	3,145	0.59	0.26	0.36	1,441	0.66	0.25	0.36
	Duration	3,744	0.62	0.44	0.51	1,344	0.54	0.56	0.55
	Frequency	801	0.64	0.39	0.48	250	0.60	0.51	0.55