Table 2.

The multilevel event extraction statistical information.

Item			Training, n (%)		Development, n (%)		Test, n (%)		Total, N
Document			131 (50)		44 (16.8)		87 (33.2)		262
Sentence			1271 (48.73)		457 (17.52)		880 (33.74)		2608
Word			27,875 (49.26)		9610 (16.98)		19,103 (33.76)		56,588
Entity			4147 (50.02)		1431 (17.26)		2713 (32.72)		8291
Event			3296 (49.36)		1175 (17.6)		2206 (33.04)		6677
	Anatomical	810 (48.36)		269 (16.06)		596 (35.58)		1675
	Molecular	340 (48.2)		125 (17.7)		240 (34.0)		705
	General	1851 (50.66)		627 (17.16)		1176 (32.18)		3654
	Planned	295 (45.9)		154 (24.0)		194 (30.2)		643