Open AccessThe use of comparability ratios to adjust hospital trend data.
Author(s) -
Samuel Gee,
William F. Page
Publication year - 1985
Publication title -
american journal of public health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.284
H-Index - 264
eISSN - 1541-0048
pISSN - 0090-0036
DOI - 10.2105/ajph.75.1.81
Subject(s) - comparability , medicine , medical diagnosis , coding (social sciences) , statistics , trend analysis , demography , mathematics , pathology , combinatorics , sociology
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.