Table 1.

 Detection of atrial fibrillation on 12 lead electrocardiogram

	Reference standard
	Atrial fibrillation	Not atrial fibrillation	Total
General practitioner
Atrial fibrillation	79	114	193
Not atrial fibrillation	20	1239	1259
Uncertain	0	2	2
Total	99	1355	1454
Primary care nurse
Atrial fibrillation	74	198	272
Not atrial fibrillation	22	1127	1149
Uncertain	0	5	5
Total	96	1330	1426
Interpretative software
Atrial fibrillation	179	21	200
Not atrial fibrillation	26	2221	2247
Uncertain	10	99	109
Total	215	2341	2556
General practitioner and interpretative software
Both positive	71	3	74
Only software positive	12	7	19
Only general practitioner positive	8	111	119
Both negative	8	1234	1242
Total	99	1355	1454