Summary of Dr. Bell's Disability Scale
This is a summary of a CFIDS disability scale from
Guide to Chronic Fatigue Syndrome by David S. Bell, MD, published
by Addison-Wesley, ISBN 0-201-40797-2.
100: Patient has no symptoms at rest, no symptoms with
normal overall activity; is able to work full-time without difficulty.
90: Patient has no symptoms at rest, has mild symptoms
has a normal overall activity level. The patient is able to work
full-time without difficulty.
80: Patient has mild symptoms at rest, symptoms worsened
Patient has minimal activity restriction noted for exertion activities
only; patient is able to work full-time with difficulty in jobs
which require exertion.
70: Patient has mild symptoms at rest. Patient clearly
daily activity limitation. Overall, the patient functions close
to 90% of expected, except for activities requiring exertion.
Ability to work full-time with difficulty.
60: Patient has mild to moderate symptoms at rest,
with daily activity
limitation clearly noted. Overall functions 70-90%. Patient is
unable to work full-time in jobs which require physical labor,
but has the ability to work full-time in light activity if hours
50: Patient has moderate symptoms at rest, and moderate
symptoms with exercise or activity. An overall activity level
is 70% of expected. Patient is unable to perform strenuous duties,
but can perform light duty, or desk-work 4-5 hours per day, requires
40: Patient has moderate symptoms at rest, and moderate
symptoms with exercise activity. The patient has an overall activity
level of 50-70% of expected. Patient is not confined to house;
is unable to perform strenuous duties, but can perform light duty/desk
work 3-4 hours/day, but requires rest periods.
30: Patient has moderate to severe symptoms at rest,
and severe symptoms
with any exercise. Patient has an overall activity level reduced
to 50% of expected; is usually confined to house. Patient is unable
to perform any strenuous tasks; is able to perform 2-3 hours of
desk work per day, but requires rest periods.
20: Patient has moderate to severe symptoms at rest;
is unable to
perform strenuous activity. Overall, activity levels are 30-50%
of expected. Patient is unable to leave house except rarely, is
confined to bed most of the day, is unable to concentrate for
more than 1 hour/day.
10: Patient has severe symptoms at rest, is bedridden
of the time. Patient has no travel outside of house. Patient
has marked cognitive symptoms preventing concentration.
0: Patient has severe symptoms on a continuous basis,
constantly, and is unable to care for him/her self.