CPDAI score total 0–15
| Not involved (0) | Mild (1) | Moderate (2) | Severe (3) | |
|---|---|---|---|---|
| Peripheral arthritis | ≤4 Joints (swollen or tender); normal function (HAQ <0.5)* | ≤4 Joints but function impaired; or > 4 joints, normal function | >4 Joints and function impaired | |
| Skin disease | PASI ≤10 and DLQI ≤10 | PASI ≤10 but DLQI >10; or PASI >10 but DLQI ≤10 | PASI >10 and DLQI >10 | |
| Enthesitis | ≤3 Sites; normal function (HAQ <0.5)* | ≤3 Sites but function impaired; or >3 sites but normal function | >3 Sites and function impaired | |
| Dactylitis | ≤3 Digits; normal function (HAQ <0.5)* | ≤3 Digits but function impaired; or >3 digits but normal function | >3 Digits and has function impaired | |
| Spinal disease | BASDAI <4; normal function (ASQol <6) | BASDAI >4 but normal function; BASDAI <4 but function impaired | BASDAI >4 and function impaired |
↵* Health assessment questionnaire (HAQ) only counted if clinical involvement of domain (joint/enthesis/dactylitis) present.
ASQoL, ankylosing spondylitis quality of life; BASDAI, Bath ankylosing spondylitis disease activity index; CPDAI, composite psoriatic disease activity index; DLQI, dermatology life quality index; PASI, psoriasis area severity index.