Table 3.

Feature ablation studies for treatment relation extraction.

(a)				(b)
Features	P	R	F	Features	P	R	F
All – semrep	85.12	82.99	84.04	semrep	81.17	65.24	72.34
All – medi	84.95	83.09	84.01	medi	80.48	76.62	78.50
All – semrep or medi	87.88	81.00	84.30	semrep or medi	73.61	85.91	79.29
All – unigram	86.75	82.05	84.33	unigram	63.56	39.87	49.01
All – bigram	86.74	81.94	84.27	bigram	77.89	16.18	26.79
All – expression	87.58	81.73	84.56	expression	74.27	39.77	51.80
All – sem type	85.94	81.00	83.40	sem type	68.78	80.27	74.08
All – cui	87.00	81.00	83.89	cui	68.80	49.48	57.56

All, the entire set of features from Table 1; F, F1-measure; P, precision; R, recall.