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National Center for Chronic Disease Prevention and Health Promotion
Division of Adult and Community Health
Health Care and Aging Studies Branch
Arthritis Program
Mailstop K-51
4770 Buford Highway NE
Atlanta, GA 30341-3724
Phone: 770.488.5464
Fax: 770.488.5964
Email Us |
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Data and Statistics
Arthritis Case Definition for Estimating Population Prevalence
- Why was the arthritis case definition changed in 2002?
- How is the current case definition of doctor-diagnosed (used since 2002)
different from the old case definition (used 1996–2001)?
- Why was the arthritis case definition changed
in 2002?
CDC, partners, and outside experts agreed to
use a new definition, starting in 2002. The reasons for this were
many.
First, the questions used to determine both doctor-diagnosed
arthritis and chronic joint symptoms were changed. A summary of the
BRFSS arthritis questions from 1996 on can be found in the
following
document.
Because of the change in the questions and the results of
validation studies, a new case definition appeared in order. Using
doctor-diagnosed arthritis as the definition:
- Is likely to be more valid than the old definition, in
identifying those most likely to have arthritis.
- Is more compatible with surveillance definitions for other
health conditions.
- Identifies those most likely to be affected by arthritis,
and thus more likely to be more receptive to our interventions.
- Would be easier to adapt to a smaller BRFSS survey being
considered for the future, because it requires only one
question.
- How is the current case definition of
doctor-diagnosed (used since 2002) different from the old case
definition (used 1996–2001)?
From 1996 to 2001, the
case definition included those with doctor-diagnosed arthritis
and/or those with chronic joint symptoms and labeled them “arthritis
or chronic joint symptoms.”
Since 2002, CDC, partners, and outside experts have agreed
on a new case definition of simply “doctor-diagnosed arthritis.”
As an interim step from 2002 to 2007 people with chronic joint
symptoms but no doctor-diagnosed arthritis, were put into a category
called called “possible arthritis.” CDC advised analysts to keep
estimates for “possible arthritis” separate from estimates for
doctor-diagnosed arthritis.
In 2009, the 2 questions on chronic joint symptoms will be
dropped and replaced with other questions that address the impact of
arthritis.
Back to Question Categories
Page last reviewed: September 9, 2008 Page last
modified: September 9, 2008 Content Source:
Division of
Adult and Community Health, National Center for Chronic Disease Prevention and Health Promotion |
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