Table 3.

Characteristics of Mayo Clinic Primary Care Internal Medicine Practice

Characteristics	Definite HF cases with reduced EF	Definite HF cases with preserved EF	Definite HF cases (unknown type)	Probable HF cases with reduced EF	Probable HF cases with preserved EF	Probable HF case (unknown type)	Possible HF cases	Non-cases
n	760	754	391	422	497	494	3,668	72,663
Sex, % female	39	61	53	35	62	57	50	56
Race, % white	93	92	94	96	96	96	93	80
Diabetes, % yes	45	48	48	42	46	43	34	12
Hypertension, % yes	92	95	96	93	97	95	86	31
ICD-9 Code 428, % yes	100	100	100	99	99	99	62	0
ICD-9 Code 428 unique dates, mean ± SD (range)*	19 ± 20 (1–165)	15 ± 17 (1–159)	16 ± 19 (1–189)	20 ± 19 (1–144)	15 ± 14 (1–97)	15 ± 13 (1–91)	2.0 ± 1.2 (1–10)	n/a
NLP HF term, % yes	100	100	100	7.6	7.7	5.1	12	0
NLP HF term unique dates, mean ± SD (range)*	12 ± 17 (1–200)	6.6 ± 8.6 (1–67)	8.8 ± 15 (1–154)	2.4 ± 2.6 (1–11)	2.0 ± 2.2 (1–12)	2.4 ± 2.1 (1–8)	1.4 ± 0.9 (1–8)	n/a
EF measured, % yes	100	100	80	100	99	70	87	21
EF measurement unique dates, mean ± SD (range)*	15 ± 13 (1–132)	11 ± 9.5 (1–131)	7.3 ± 7.0 (1–63)	12 ± 11 (1–87)	9.1 ± 7.1 (1–54)	5.7 ± 5.3 (1–48)	7.1 ± 6.3 (1–52)	4.1 ± 3.7 (1–54)
EF, mean ± SD	42 ± 16	59 ± 9.6	51 ± 15	40 ± 15	59 ± 10	51 ± 15	54 ± 12	61 ± 6.2
History of myocardial infarction, % yes	88	76	80	91	82	82	65	12
Medication history
Angiotensin converting enzyme use, % yes	79	69	73	83	70	67	55	14
Angiotensin receptor blocker use, % yes	20	26	17	21	23	16	12	3
Beta blocker use, % yes	80	73	69	76	69	60	58	16
Calcium channel blocker use, % yes	39	48	39	39	53	42	31	7

EF ejection fraction, HF heart failure, ICD-9 International Classification of Diseases, 9^th Revision, NLP natural language processing, SD standard deviation

^*For those with non-missing data