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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)