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Table 4 Proportion of deaths with a cause recorded in CPRD primary care data (N = 600 for each 3-year band)

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

How cause of death is recorded in primary careYears 2001–2003Years 2004–2006Years 2007–2009Accuracy (95% CI)
Transcribed death certificate entry (e.g. 1a Heart failure, 1b Acute myocardial infarction)
 Read codes46 (7.7%)103 (17.2%)112 (18.7%)59% (52%, 65%)
 Free text32 (5.3%)41 (6.8%)47 (7.8%)53% (44%, 63%)
Explicit cause of death (e.g. Cause of death: myocardial infarction)
 Read codes26 (4.3%)47 (7.8%)36 (6.0%)30% (22%, 40%)
 Free text16 (2.7%)17 (2.8%)16 (2.7%)55% (40%, 69%)
Cause of death implied by diagnosis dated on or after date of death
 Read codes140 (23.3%)79 (13.2%)52 (8.7%)44% (37%, 51%)
 Free text69 (11.5%)67 (11.2%)76 (12.7%)40% (34%, 46%)
No cause of death in CPRD271 (45.2%)246 (41.0%)261 (43.5%)