The Simplified Psoriasis Index (SPI) is intended to be a clinically useful method of assessing psoriasis. There are several assessments including one for psychological impact and one for historical course and interventions. The authors are from the University of Manchester and Mahidol University in Bangkok.
Patient selection: psoriasis
Measures:
(1) psychosocial impact (SPI-p)
(2) historical course and interventions (SPI-i)
Psychosocial impact is measured on a 10 cm VAS scale, reported to the nearest integer.
Historical Course
Finding
Points
duration
<= 10 years
0
10 to 20 years
1
> 20 years
2
history of erythrodermic or generalized pustular psoriasis
no
0
yes
1
history of a hospital admission for psoriasis
no
0
yes
1
Therapeutic History
Findings
Points
at least one course of UV treatment or PUVA
no
0
yes
1
ever treated with methotrexate
no
0
yes
1
ever treated with acitretin or etretinate
no
0
yes
1
every treated with cyclosporine
no
0
yes
1
ever treated with a biological
no
0
yes
1
every treated with any other systemic agent for psoriasis
no
0
yes
1
score for historical course and therapy =
= SUM(points for all of the parameters)
Interpretation:
• minimum score for psychosocial impact: 0
• maximum score for psychosocial impact: 10
• minimum score for historical items: 0
• maximum score for historical items: 10
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