Table 5.

Combining diagnostic and drug information to identify patients with diabetes and heart disease.

Diabetes				Heart disease
Practice	No. ICPC /No. ATC	Overlap	% identified by ICPC	Practice	No. ICPC /No. ATC	Overlap	% identified by ICPC
A	143 / 99	89	94	A	147 / 79	46	82
B	20 / 15	12	87	B	6 / 7	2	55
C	4 / 2	2	100	C	7 / 1	0	88
D	82 / 57	52	94	D	176 / 103	70	84
E	23 / 16	13	89	E	23 / 7	4	89
F	25 / 16	15	96	F	57 / 33	27	91
G	111 / 77	74	97	G	161 / 110	59	76
H	30 / 11	11	100	H	19 / 16	9	73
I	31 / 14	13	97	I	32 / 11	7	89
J	141 / 84	73	93	J	214 / 147	77	75
K	61 / 37	35	97	K	108 / 60	43	86
L	91/ 51	50	99	L	101 / 72	50	82
M	33 / 23	23	100	M	35 / 17	7	78
N	12 / 10	8	86	N	19 / 20	7	59

ICPC = InternationalClassification for Primary Care (coding system for diagnoses) ATC = Anatomical Therapeutical Chemical (coding system for drugs)