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Table 3 Determinants of use of the patient decision aid (n = 123)

From: Evaluation of a patient decision aid for initiating disease modifying anti-rheumatic drugs

Variables Categories/range Users PtDA
(n = 69)
Non-users PtDA
(n = 53)
P a
Sociodemographic variables
 Age, years   52 ± 13 (69) 58 ± 12 (53) 0.003b
 Gender, % (n) Women 57 % (39) 68 % (36)  
Men 43 % (30) 32 % (17) n.s.
 Marital status, % (n) Married/living with partner 87 % (60) 91 % (48)  
Not married/living alone 13 % (9) 9 % (5) n.s.
 Education, % (n) Low 20 % (14) 43 % (23)  
Medium 51 % (35) 47 % (25)
High 29 % (20) 9 % (5) 0.004
 Employment, % (n) Employed/studying 65 % (33) 69 % (24)  
Not employed/studying 35 % (18) 31 % (11) n.s.
Health-related variables
 Diagnosis, % (n) Rheumatoid Arthritis 81 % (52) 80 % (39)  
Psoriatic Arthritis 13 % (8) 14 % (7)
Ankylosing Spondylitis 6 % (4) 6 % (3) n.s.
 Years since diagnosis, % (n) <1 19 % (13) 32 % (17)  
1–5 43 % (29) 40 % (21)
6–10 13 % (9) 9 % (5)
>10 25 % (17) 19 % (10) n.s.
 Pain (NRS) Range 0–10 4.7 ± 2.5 (69) 4.8 ± 2.8 (53) n.s.b
 Physical function (HAQ-II) range 0–3 2.14 ± 0.70 (69) 2.10 ± 0.71 (53) n.s.b
Preference-related variables
 Preferred role in decision-making (CPS), % (n) (Mostly) doctor 9 % (6) 8 % (4)  
Shared 78 % (54) 75 % (39)
(Mostly) patient 13 % (9) 17 % (9) n.s.
 Need for information (CPQ) range 1–5 4.6 ± 0.6 (69) 4.5 ± 0.7 (121) n.s.b
Number of treatment options
 Suggested by rheumatologist, % (n) 1 option 38 % (23) 73 % (36)  
>1 option 62 % (38) 27 % (13) 0.000
  1. Values are the mean ± standard deviation (number) unless otherwise indicated. Percentages do not include missing cases. aTested using the Pearson chi-square tests unless otherwise indicated. bTested using the t test. PtDA patient decision aid, n.s. not significant (p > 0.05), NRS numerical rating scale, HAQ-II Health Assessment Questionnaire, version 2 [28], CPS Control Preference Scale [5, 29], CPQ Cologne Preference Questionnaire [30, 31]]