Table 13.

Confusion matrix over unstructured abstracts.

Class		Prediction
				B	I	O	P	S	Ot
	B	1505	15	272	70	2	24
G	I	141	30	120	64	2	20
o	O	496	13	1722	18	0	34
l	P	161	24	73	158	1	26
d	S	36	3	7	26	2	10
	Ot	170	11	245	15	0	89

B: Background, I: Intervention, O: Outcome, P: Population, S: Study Design, and Ot: Other.