Table 2.

Patient demographics

Characteristics	n	%
Sex (n, %)
Female	98	24.8
Male	297	75.2
Age (n, %)
20–29 years	3	0.8
30–39 years	30	7.6
40–49 years	99	25.1
50–59 years	124	31.4
60–69 years	100	25.3
70–79 years	39	9.9
≥80 years	0	0.0
Age at which psoriasis developed (n, %)
<16 years	35	8.9
16–39 years	173	43.8
40–59 years	146	37.0
≥60 years	41	10.4
Years since psoriasis diagnosis (n, %)
<1 year	13	3.3
1 to <6 years	90	22.8
6 to <11 years	66	16.7
11 to <21 years	102	25.8
≥21 years	124	31.4
Percentage of body surface area affected by psoriasis (n, %)a
<3%	147	37.2
3%	111	28.1
6%	76	19.2
≥10%	61	15.4
Affected areas by psoriasis (n, %)
Scalp	256	64.8
Palms	58	14.7
Nail	98	24.8
Back of hand	113	28.6
Soles	44	11.1
Top of feet	105	26.6
Groin	83	21.0
Genital area	70	17.7
Armpit	48	12.2
Other	282	71.4
No areas are affected by psoriasis	5	1.3
Frequency of visit for treatment of psoriasis (n, %)
Once or a few times a week	13	3.3
Once every 2 weeks	16	4.1
Once a month	136	34.4
Once every 2 months	96	24.3
Once every 3 months	69	17.5
Once every 4 months or more	36	9.1
None of the above	29	7.3
Presence of joint pain (n, %)
Yes	72	18.2
No	323	81.8
Current treatment for psoriasis (n, %)
Topical medication	371	93.9
Oral medication	94	23.8
Phototherapy	36	9.1
Periodically administrated injection (biologics)	36	9.1
Other	7	1.8
No treatment received currently	0	0.0
Presence of knowledge of the High‐Cost Medical Expense Benefit
Yes	332	84.1
No	63	15.9
Level of annual income or household income (n, %)
Exclusion from residential taxation	32	8.1
Annual income <¥3.7 million	142	35.9
Annual income from ¥3.7 to <¥7.7 million	139	35.2
Annual income from ¥7.7 to <¥11.6 million	37	9.4
Annual income ≥¥11.6 million	18	4.6
I do not want to answer	27	6.8
Presence of knowledge of biologic drugs (only patients who had no experience of periodically administrated injection answered; n, %)
Yes	163	41.3
No	188	47.6

^aThe participant selected a category that best described his/her condition.