Decision aids can decrease decisional conflict in patients with hip or knee osteoarthritis: Randomized controlled trial

Table 1 Baseline characteristics of the patients, n (%)

	Without DA	With DA
Sex
Male	30 (46)	33 (50)
Female	35 (54)	33 (50)
Age (yr; mean ± SD)	66 ± 10	68 ± 11
Level of education
Pre-vocational secondary or secondary vocational education	15 (23)	22 (33)
Senior general secondary education	10 (16)	8 (12)
Pre-university education	30 (46)	24 (37)
Higher professional education or university	8 (12)	10 (15)
Unknown	2 (3)	2 (3)
Duration of pain in d (mean ± SD)	47 ± 75	55 ± 76
Marital status
Single	13 (20)	16 (24)
Unmarried	8 (12)	8 (12)
Married	37 (57)	30 (45)
Divorced	2 (3)	1 (2)
Widowed	4 (6)	9 (14)
Unknown	1 (2)	2 (3)
Working status
Working, full time	8 (12)	16 (24)
Working, part time	12 (18)	7 (10)
Sickleave	2 (3)	1 (2)
Retired	36 (55)	34 (51)
Unemployed, able to work	3 (5)	1 (2)
Unemployed, unable to work	3 (5)	3 (5)
Unknown	1 (2)	4 (6)
Location
Left hip	10 (15)	9 (14)
Right hip	24 (37)	15 (23)
Both hips	6 (9)	3 (5)
Left knee	13 (20)	13 (20)
Right knee	9 (14)	18 (26)
Both knees	3 (5)	6 (9)
Unknown	0 (0)	2 (3)
Had non-operative treatment before
Yes	18 (28)	25 (38)
No	47 (72)	39 (59)
Unknown	0 (0)	2 (3)
Hospital
Hospital 1	2 (3)	9 (14)
Hospital 2	23 (35)	21 (32)
Hospital 3	27 (42)	26 (39)
Hospital 4	13 (20)	10 (15)

DA: Decision aid.