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Table 1 The distribution of patients according to the number of stroke codes registered over the study period (n = 47,845).

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

Number of stroke codes N Percentage
One 36,857 77
Two 8,277 17
Three 2,151 5
Four 446 1
Five 91 < 1
Six 21 < 1
Seven 2 < 1