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Table 3 Type of MI as recorded in CPRD primary care data, for patients with a ‘gold standard’ MI subtype record in MINAP

From: Natural language processing for disease phenotyping in UK primary care records for research: a pilot study in myocardial infarction and death

  

Subtype of MI

Primary care source of type of MI

 

STEMI (N = 315)

NSTEMI (N = 293)

Structured (Read codes)

(number of patients)

STEMI

41

6

NSTEMI

6

96

Free text

(number of patients)

STEMI

13

5

NSTEMI

5

23

Patients with no information on type of MI in primary care

250

163

Accuracy of MI classification using structured data

Sensitivity, %

13.0 (9.5, 17.2)

32.8 (27.4, 38.5)

Specificity, %

98.0 (95.6, 99.2)

98.1 (95.9, 99.3)

Positive predictive value, %

87.2 (74.3, 95.2)

94.1 (87.6, 97.8)

Accuracy of MI classification using structured and free text data

Sensitivity, %

17.1 (13.1, 21.8)

40.6 (34.9, 46.5)

Specificity, %

96.2 (93.4, 98.1)

96.5 (93.8, 98.2)

Positive predictive value, %

83.1 (71.7, 91.2)

91.5 (85.4, 95.7)