I.

Agreement in Injury Classification Codes^* by Level of Coding Detail Among 15,447 SOII Cases Linked to Washington State Fund WC Claims

	Division (1-digit code)			Major Group (2-digit code)			Group (3-digit code)			Subgroup (4 digit-code)
	n	%	Kappa	n	%	Kappa	n	%	Kappa	n	%	Kappa
Nature of injury or illness	14,525	94	0.62	10,966	71	0.62	10,268	67	0.57	10,041	65	0.55
Part of body	13,376	87	0.82	11,844	77	0.74	10,100	65	0.63	10,091	65	0.63
Event or exposure	13,055	85	0.78	10,672	69	0.64	6,875	45	0.42	6,647	43	0.40

Data presented are number of linked records with matching codes, percent of total linked records, and kappa statistic.

^*Both the SOII and WC cases were coded using the Occupational Injury and Illness Classification System, a hierarchical classification system with general categories containing codes of greater specificity. Most codes available in OIICS are 3- or 4-digits in length, although some are limited to 1- or 2-digits. The most general category, the Division, is designated by the first digit of the code. To assess agreement in assignment of the Division, codes were aggregated to the first digit. Major Group included aggregation to the 2-digit level plus codes with no more detail beyond the 1-digit Division level. Group included aggregation to the 3-digit level plus terminal 1- and 2-digit codes. Subgroup consists of all codes as assigned with no aggregation.