Table 1.

Population and subgroup characteristics

DEMOGRAPHICS	All	PsO no pain ever	PsO previous pain	PsO pain now	PsA	p-value*
N	561	178	104	130	108
Male	212 (38%)	79 (44%)	34 (33%)	36 (28%)	40 (37%)	0.02
Age (years)	58 (43-68)	58 (43-68)	56 (42-63)	53 (43-63)	58 (48-68)	0.05
Body Mass Index	27 (24-32)	26 (23-30)	28 (24-32)	29 (25-33)	28 (24-33)	0.01
No current occupation¹	119 (21%)	20 (11%)	23 (22%)	34 (26%)	35 (32%)	<0.001
PsO/PsA FEATURES	All	1. PsO no pain ever	2. PsO pain ever		3. PsA	1 vs. 2	1 vs. 3	2 vs. 3
N	561	178	234		108
BSA (%)	1 (1-2)	1(1-2)	1 (1-2)		2 (1-2)	0.10	<0.001	0.01
Nail psoriasis	134 (24%)	27 (15%)	50 (21%)		46 (48%)	0.13	<0.001	<0.001
‘Dactylitis’ ^2a	80 (14%)	2 (1%)	34 (15%)		40 (42%)	<0.001	<0.001	<0.001
‘Enthesitis’ ^2b	74 (13%)	4 (2%)	30 (13%)		39 (41%)	<0.001	<0.001	<0.001
QUALITY OF LIFE AND DISABILITY	All	1. PsO no pain now	2. PsO pain now		3. PsA	1 vs. 2	1 vs. 3	2 vs. 3
N	561	282	130		108
DLQI score (0-30)	2 (1-5)	1 (1-4)	2 (1-5)		2 (1-6)	0.001	0.04	0.52
EQ5D index (0-1)	0.797 (0.691-0.859)	0.859 (0.768-1)	0.732 (0.679-0.859)		0.702 (0.598-0.802)	<0.001	<0.001	0.53
HAQ score (0-3)	0.63 (0-1.25)		0.50 (0-0.88)		0.88 (0.13-1.38)			0.03

Numbers are numbers (%) (binary data), median (interquartile range) (continuous data).
BSA: Body Surface Area (palm-size areas of the body with psoriasis). DLQI: Dermatology life quality index (higher scores = higher impact of disease). EQ5D: European Quality of life-5 Dimensions -5 Domain (higher scores = better health state). HAQ: Health assessment questionnaire. PsA: Psoriatic arthritis. PsO: Psoriasis.
* Multiple groups: Chi-square test/ Kruskal-Wallis test. Pairwise: Fishers exact test/Mann-Whitney U test
1. I.e. work/studies/retirement 2. a. “Swollen entire finger or toe” b. “Tender or swollen tendon”.