Table 6.

Overall performance of PICO entity recognition models on the validation set

Model	Weight	F1	Recall	Precision
BiLSTM	–	41.7	44.2	39.5
BiLSTM-CRF	–	58.8	56.9	61.0
BERT	Base	56.0	62.7	50.6
	BioBERT	64.2	69.8	59.4
	PubMed-abs	65.0	70.5	60.2
	PubMed-full	68.1	73.0	63.8
BERT-CRF	Base	57.7	62.9	53.3
	BioBERT	65.1	70.0	60.9
	PubMed-abs	65.5	70.9	60.9
	PubMed-full	68.0	72.8	63.7
BERT  - BiLSTM  - CRF	Base	60.8	66.4	56.1
	BioBERT	66.0	70.0	62.5
	PubMed-abs	68.1	73.3	63.5
	PubMed-full	68.0	72.8	63.8