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Table 2 Intraclass correlation coefficients indicating practice-level variation in the recording of the commonest stroke codes (n = 79,847).

From: Potential application of item-response theory to interpretation of medical codes in electronic patient records

GPRD   Overall Relative frequency2
207099 CVA unspecified 0.15 17%
234279 Stroke/CVA unspecified 0.25 24%
243296 Cerebrovascular accident unspecified 0.05 3%
213214 Stroke monitoring 0.16 14%
341089 Annual review 0.22 9%
234277 Cerebral infarction 0.04 3%
289093 Subarachnoid haemorrhage 0.00 3%
234275 Cerebral arterial occlusion 0.12 2%
298378 CVA- cerebral artery occlusion 0.08 3%
288824 Hemiparesis 0.01 3%
288823 Hemiplegia 0.01 1%
261654 Intracerebral haemorrhage 0.01 2%
225136 CVA due to intracerebral haemorrhage 0.05 2%
285273/257802 H/O Stroke or CVA 0.04 3%