Table 2: Misclassification rates as percentage of all admissions (n = 92,553).

Coding fields taken account	Misclassification rate
1	70–75%*
1 to 2	55–60%*
1 to 3	30–35%*
1 to 4	20–25%*
1 to 5	10–15%*
1 to 6	5–10%*
1 to 7	<5%*
1 to 8	<3%*
1 to 9	<2%*
1 to 10	<1%*
1 to 11	<1%*
1 to 12	<1%*
1 to 13	<1%*
1 to 14	<1%*

*Information Governance Disclosure Control rules meant exact numbers could not be published.