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Unformatted text preview: ables originally
measured on an ordinal scale (e.g. severity of preeclampsia: none, mild, severe) are often categorized
into several binary variables during statistical analysis.
Consider, as a motivating example, the data set described in Table 1. This data is derived from a clinical
* The Center for Perinatal Health Initiatives, Department of Obstetrics,
Gynecology and Reproductive Sciences, University of Medicine and
Dentistry of New Jersey, Robert Wood Johnson Medical School,
125 Paterson St, New Brunswick, NJ 08901–1977, USA.
Department of Epidemiology, The Rollins School of Public Health,
Emory University, Atlanta, GA, USA. 1323 1324 INTERNATIONAL JOURNAL OF EPIDEMIOLOGY TABLE 1 Ratings of drugs on a single-dose, post-operative analgesic clinical triala
Drug Rating of the drugs
Poor C15 & C60
Z100 & EC4
Log-odds ratioc, β
Standard error se (β )
Odds ratios, eβ Fair Good Very goodb Total 17
60 1.0 a Source: ref.2
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This document was uploaded on 02/25/2014.
- Spring '11