Patient selection: ankylosing spondylitis
Parameters:
(1)
patient global assessment as a VAS score on a 0 to 10 cm scale
(2) back pain (from BASDAI) as a VAS score on a 0 to 10 cm scale
(3) peripheral pain and swelling (from BASDAI) as a VAS score on a 0 to 10 cm scale
(4) duration of morning stiffness (from BASDAI) in minutes as 0 to 10 (see below)
(5) ESR in mm in first hour
points for morning stiffness =
= MIN(10,(minutes)/12))
points for ESR =
= MIN(10,((ESR)/10))
SASDAS =
= SUM(points for all 5 parameters)
Interpretation:
• minimum score: 0
• maximum score: 50
• The higher the score the more active the disease.
|
Total Score
|
Disease Activity
|
|
< 7.9
|
inactive
|
|
7.9 to 13.8
|
moderate
|
|
13.9 to 27.6
|
high
|
|
> 27.6
|
very high
|
Performance:
• The sensitivity was 82% and specificity 99% for discriminating inactive from moderate disease activity.
• The sensitivity was 90% and specificity 99% for discriminating moderate from high disease activity.
• The sensitivity was 93% and specificity 100% for discriminating high from very high disease activity.
