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Table 1 Most common Read codes extracted from free text for 2000 patients within 90 days of MI in CALIBER (top five codes in each category)

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

Number of records (%)Read codeRead term
Current or previous condition (diagnosis Read codes)
 887 (8.1%)G30z.00Acute myocardial infarction NOS
 443 (4.1%)R065.00[D] Chest pain
 304 (2.8%)C10..00Diabetes mellitus
 272 (2.5%)G307100Acute non-ST segment elevation myocardial infarction
 256 (2.3%)G33..00Angina pectoris
Current or previous condition (non − diagnosis Read codes)
 991 (9.5%)8H3Z.00Other hospital admission NOS
 913 (8.8%)8H…00Referral for further care
 795 (7.6%)1M…00Pain
 469 (4.5%)173..00Breathlessness
 445 (4.3%)8HA..11Discharged from follow up
Quantitative test result
 577 (15.8%)42Z7.00Red blood cell distribution width
 142 (3.9%)42M..00Lymphocyte count
 141 (3.9%)42N..00Monocyte count
 139 (3.8%)42K..00Eosinophil count
 138 (3.8%)42J..00Neutrophil count
Absence of condition (diagnosis Read codes)
 121 (7.8%)R023.00[D] Oedema
 105 (6.8%)G33..00Angina pectoris
 90 (5.8%)R065.00[D] Chest pain
 57 (3.7%)A....00Infectious and parasitic diseases
 38 (2.5%)R006200[D] Fever NOS
Absence of condition (non-diagnosis Read codes)
 281 (15.6%)182..00Chest pain
 274 (15.2%)173..00Breathlessness
 208 (11.5%)1M…00Pain
 89 (4.9%)2I18.12O/E - tenderness
 48 (2.7%)199..00Vomiting
Suspected condition (diagnosis Read codes)
 70 (8.2%)G30z.00Acute myocardial infarction NOS
 48 (5.6%)K190.00Urinary tract infection, site not specified
 40 (4.7%)A….00Infectious and parasitic diseases
 32 (3.8%)G33..00Angina pectoris
 23 (2.7%)G581.13Impaired left ventricular function
Suspected condition (non-diagnosis Read codes)
 44 (16.5%)8H…00Referral for further care
 18 (6.7%)8H3Z.00Other hospital admission NOS
 16 (6.0%)1M…00Pain
 9 (3.4%)173..00Breathlessness
 7 (2.6%)2C2..11O/E - anaemic