Table 2

Information extracted from 200 epilepsy clinic letters: number of items and number of letters with items extracted.

Information extracted from 200 epilepsy clinic letters
Variable	All items extracted					Number of letters with items extracted
Variable	Clinician	Algorithm	TP	FP	FN	Clinician	Algorithm	TP	FP	FN
Clinic date	191	188	186	2	5	186	181	181	0	5
Date of birth	201	197	197	0	4	199	195	195	0	4
Epilepsy diagnosis	383	387	341	46	42	150	152	143	9	7
Epilepsy type	89	79	71	8	18	70	67	61	6	9
Focal seizures	145	105	101	4	44	71	61	59	2	12
Generalised seizures	151	89	79	10	72	76	58	52	6	24
Seizure frequency	153	95	82	13	71	119	77	71	6	48
Medication	316	309	297	12	19	157	145	143	2	14
CT scan	17	18	10	8	7	16	13	10	3	6
MRI scan	109	91	75	16	34	66	60	52	8	14
EEG	170	157	128	29	42	79	82	71	11	8
All	1925	1715	1567	148	358	1189	1091	1038	53	151

EEG, electroencephalogram; ExECT, extraction of epilepsy clinical text; FN, false negative (an item annotated by the clinician but not annotated by ExECT); FP, false positive (an item annotated by ExECT but not annotated by the clinician); TP, true positive (an item annotated by the clinician and ExECT).