Enriching a primary health care version of ICD-10 using SNOMED CT mapping

Table 6 Different attribute values in each chapter

Attribute type	Chapters in KSH97-P
	I	II	III	IV	V	VI	VII	VIII	IX	X	XI	XII	XIII	XIV	XV	XVI	XVII	XVIII	XIX	XXI	All
After	1.5			1.0		1.0			1.0		1.0	1.0							1.0		1.3
Associated finding																				1.0	1.0
Associated morphology	1.5	3.8	.7	1.3	.5	1.0	1.4	1.4	1.7	1.8	1.5	1.5	1.7	1.6	1.0	1.5	2.1	1.3	3.7		2.7
Associated with			3.0	1.0			1.0			1.0		1.0						1.0	1.7		1.4
Causative agent	1.1			1.0	1.8	.5		1.0		1.0	1.0	1.0	1.0	2.0	2.0	3.0	1.0		1.0	1.0	1.3
Clinical course	3.0				1.0	1.0	1.0	2.0	3.0	5.0	1.0		1.0	1.0			1.0	1.0	1.0		1.3
Direct device																				1.0	1.0
Direct substance																				1.0	1.0
Due to			1.0	1.0			1.0			.7		1.6							1.0		1.5
Finding context																		4.0		1.0	5.0
Finding informer																		3.0			3.0
Finding method																	1.0	4.0		1.0	3.3
Finding site	1.7	1.3	3.0	1.8	2.0	1.3	1.6	1.9	1.3	1.6	1.4	3.6	1.1	1.7	1.0	.9	1.0	1.4	.9		2.0
Has definitional manifestation	4.0		1.3	1.0	1.8	1.8		1.0	1.5	1.0	1.0	1.3	2.0	2.0	1.0	.3	1.0	.8			2.0
Has focus																				1.3	1.3
Has intent																				1.0	1.0
Has interpretation							4.5							2.0				1.8			4.0
Interprets					.5	.7	3.0	1.5				1.0	1.0	1.0			1.0	.9		1.0	1.2
Method																				2.0	2.0
Occurrence				1.0	1.0					1.0			1.0		1.0	3.3	36.0				9.0
Pathological process						1.0						1.0									2.0
Procedure context																				1.0	1.0
Procedure device																				1.0	1.0
Procedure site																				1.0	1.0
Procedure site - Indirect																				1.0	1.0
Subject relationship context																		4.0		1.0	3.0
Temporal context																		4.0		1.0	3.0

The number of categories, in each chapter and in total, for which each attribute type is used, divided by the number of unique attribute values for each attribute type. This means the table shows the average number of categories that have the same attribute value for each attribute type. The corresponding median values are also calculated in the study and are in most cases close to the average values, but the median values are left out from the paper to shorten the paper.
For example, 66 of the 79 categories in chapter II Neoplasms have attributes of type Finding site with 49 different attribute values. This means that the corresponding value in the table is 66/49 = 1.3. If, hypothetically, all 79 categories in the chapter have had attributes of type Finding site with attribute value Body structure, the corresponding value would be 79/1 = 79. In the actual case the attribute information is informative, but in the hypothetical case the attribute information is of limited use.
If few categories have attributes of a specific attribute type in a specific chapter these categories can easily have unique attribute values for these attributes. Therefore it is not useful to compare values in Table 6 for attribute types and chapters where Table 5 shows that only a few categories have attributes.

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