Table 4 Comparison of Adherence Mean Rank score in relation to associated variables among Psoriasis patients (n = 575)

Age (years)

  ≤ 20

(53.8)

(38.5)

(7.7)

0.004

201.77

 21–30

(75.0)

(19.0)

(6.0)

209.42

 31–40

(77.8)

(18.2)

(4.0)

190.32

 41–50

(66.7)

(28.7)

(4.6)

226.67

 51–60

(40.0)

(48.6)

(11.4)

288.56

 60 < 

(66.7)

(33.3)

(0.0)

232.92

Gender

 Female

(68.9)

(25.2)

(5.9)

0.660

 Male

(72.6)

(22.9)

(4.5)

Marital status

 Single

(69.2)

(25.0)

(5.8)

0.161

 Married

(70.6)

(24.9)

(4.5)

 Widowed/Divorced

(85.7)

(0.0)

(14.3)

Educational level

 Lower than high school graduate

(62.5)

(37.5)

(0.0)

0.238

 High school graduate

(69.0)

(23.9)

(7.1)

 Higher than high school graduate

(72.3)

(22.7)

(5.0)

Employment status

 Employed

(72.7)

(21.3)

(6.0)

0.530

 Student

(65.5)

(27.6)

(6.9)

 Housewife

(67.3)

(30.1)

(2.7)

 Jobless

(72.3)

(21.5)

(6.2)

Income (monthly) In dollars

  < 500

(72.8)

(23.6)

(3.7)

0.798

 500–1000

(69.9)

(22.8)

(7.3)

 1000–1500

(68.3)

(25.0)

(6.7)

 1500 < 

(67.3)

(28.6)

(4.1)

Insurance coverage

 Insured

(69.9)

(24.9)

(5.2)

0.815

 Non-insured

(72.8)

(21.9)

(5.3)

Smoking

 Smoker

(75.6)

(21.8)

(2.6)

0.402

 Non-smoker

(69.6)

(24.6)

(5.8)

Comorbidity

 Yes

(65.7)

(31.4)

(2.9)

0.023

213.21

 No

(73.1)

(20.5)

(6.4)

211.40

Years with Psoriasis

  < 2

(65.5)

(27.6)

(6.9)

0.213^*

 2–5

(63.8)

(25.9)

(10.3)

 5–10

(73.4)

(18.8)

(7.8)

 10 < 

(72.1)

(24.6)

(3.3)

Psoriasis severity

 Mild

(68.8)

(26.0)

(5.2)

0.684

 Moderate

(73.3)

(21.2)

(5.1)

 Severe

(66.7)

(27.9)

(5.4)

Treatment type

 Topical

(82.7)

(15.2)

(2.2)

0.000^*

175.56

 Injection

(53.5)

(36.6)

(9.9)

263.37

 Oral

(58.1)

(33.7)

(8.1)

253.41

 Phototherapy

(80.0)

(20.0)

(0.0)

145.60

Number of current medications

 1–3

(72.1)

(22.3)

(5.6)

0.100

 3 < 

(63.2)

(33.8)

(2.9)

Treatment cost (monthly) In dollars

  < 25

(75.7)

(19.6)

(4.7)

0.381

 25–50

(75.3)

(22.1)

(2.6)

 50–75

(66.7)

(26.3)

(7.0)

 75 < 

(64.5)

(29.1)

(6.4)

Experience of adverse effects by medication

 Yes

(75.3)

(21.7)

(3.0)

0.019

202.49

 No

(64.9)

(21.1)

(8.0)

223.89

Overall satisfaction with treatment

 Low

(76.0)

(20.7)

(3.4)

0.001

188.30

 Medium

(71.8)

(22.7)

(5.5)

218.04

 High

(46.2)

(42.3)

(11.5)

287.86

Health literacy level

 Insufficient

(82.4)

(17.6)

(0.0)

0.015

153.12

 Sufficient

(75.0)

(20.8)

(4.2)

196.92

 High

(59.0)

(32.8)

(8.2)

255.32

Cronbach’s alpha of adherence = 0.71