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American Journal of Public Health, Vol. 75, Issue 1 81-82, Copyright © 1985 by American Public Health Association

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The use of comparability ratios to adjust hospital trend data.

S C Gee and W F Page

Hospital trend data may be affected by changes in diagnostic coding schemes. We studied the change from ICDA-8 (I-8) to ICD-9-CM (I-9) in a sample of roughly 13,600 double-coded Veterans Administration hospital diagnoses. Comparability ratios were computed and used to adjust trend data which overlap the time period when the shift from I-8 to I-9 occurred. With this adjustment for change in diagnostic coding scheme, apparent diagnostic trends are substantially altered.






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Copyright © 1985 by the American Public Health Association