Table 1.

Items of the P-SIM

Item	Response scale
1. During the past 24 h, how severe was your worst skin itching?	0 (No itching)–10 (Very severe itching)
2. During the past 24 h, how severe was your worst skin redness?	0 (No skin redness)–10 (Very severe skin redness)
3. During the past 24 h, how severe was your worst skin pain?	0 (No skin pain)–10 (Very severe skin pain)
4. During the past 24 h, how severe was your worst skin burning?	0 (No skin burning)–10 (Very severe skin burning)
5. During the past 24 h, how severe was your worst skin scaling?	0 (No skin scaling)–10 (Very severe skin scaling)
6. During the past 24 h, how severe was your worst skin cracking?	0 (No skin cracking)–10 (Very severe skin cracking)
7. During the past 24 h, how severe was your worst skin dryness?	0 (No skin dryness)–10 (Very severe skin dryness)
8. During the past 24 h, how severe was your worst skin irritation?	0 (No skin irritation)–10 (Very severe skin irritation)
9. During the past 24 h, how severe was your worst skin sensitivity?	0 (No skin sensitivity)–10 (Very severe skin sensitivity)
10. During the past 24 h, how severe was your worst skin lesions (red marks, spots, or inflammation)?	0 (No skin lesions)–10 (Very severe skin lesions)
11. During the past 24 h, how severe was your worst skin thickening (hardening or roughening)?	0 (No skin thickening)–10 (Very severe skin thickening)
12. During the past 24 h, at its worst, how severe was your psoriasis-related fatigue (weariness, tiredness)?	0 (No fatigue)–10 (Worst possible fatigue)
13. During the past 24 h, at its worst, how much embarrassment did you feel as a result of your psoriasis?	0 (No feelings of embarrassment)–10 (Worst possible feelings of embarrassment)
14. During the past 24 h, at its worst, how much did your psoriasis impact your choice of clothing?	0 (No impact on my choice of clothing)–10 (Completely impacted my choice of clothing)