Composite psoriatic arthritis disease activity index (CPDAI).
| Condition | None (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 |
↵* HAQ counted only if clinical involvement of domain (joint/enthesitis/dactylitis) is present. ASQoL: Ankylosing Spondylitis Quality of Life Questionnaire7;
BASDAI: Bath Ankylosing Spondylitis Disease Activity Index8; DLQI: Dermatology Quality of Life Index9; HAQ: Health Assessment Questionnaire10; PASI: Psoriasis Area and Severity Index11.