Table 3.

Associations of socio-economic baseline factors with each response measure at follow-up (univariable logistic regression analyses)

		ASAS 20 response		ASAS 40 response		ASDAS ≥1.1 reduction		ASDAS score <2.1
Baseline variables		OR	(95% CI)	OR	(95% CI)	OR	(95% CI)	OR	(95% CI)
Age	Per year	0.99	(0.97, 1.004)	0.99	(0.97, 1.01)	0.99	(0.97, 1.01)	0.99	(0.97, 1.01)
Gender	Female vs male	1.01	(0.64, 1.60)	0.69	(0.42, 1.14)	0.65	(0.38, 1.11)	0.66	(0.37, 1.18)
Education	Secondary school	Ref		Ref		Ref		Ref
	Apprentice	1.90	(0.89, 4.07)	2.02	(0.91, 4.47)	1.65	(0.70, 3.93)	1.97	(0.80, 4.86)
	College	1.00	(0.57, 1.75)	1.45	(0.78, 2.71)	0.64	(0.33, 1.02)	1.17	(0.57, 2.42)
	University degree	2.31	(1.24, 4.30)	3.09	(1.63, 5.85)	1.20	(0.91, 2.37)	2.64	(1.26, 5.53)
	Further degree	1.81	(0.75, 4.36)	1.50	(0.58, 3.84)	0.53	(0.20, 1.45)	3.51	(1.29, 9.54)
Employment	Full-time	Ref		Ref		Ref		Ref
	Part-time	0.48	(0.25, 0.92)	0.36	(0.17, 0.77)	0.39	(0.18, 0.82)	0.23	(0.09, 0.57)
	Unpaid/seeking	1.24	(0.40, 3.78)	0.90	(0.31, 2.66)	0.26	(0.07, 1.003)	0.21	(0.04, 1.04)
	Retired	0.73	(0.35, 1.49)	0.93	(0.45, 1.91)	0.96	(0.43, 2.15)	0.68	(0.30, 1.55)
	Retired/ unemployed due to ill-health	0.26	(0.14, 0.49)	0.19	(0.09, 0.43)	0.32	(0.16, 0.65)	0.04	(0.01, 0.18)
	Student	1.85	(0.19, 18.20)	1.36	(0.19, 9.87)	2.33	(0.24, 23.04)	2.90	(0.29, 28.69)
Deprivation	1 (least deprived)	Ref		Ref		Ref		Ref
(quintiles)	2	0.96	(0.52, 1.76)	0.71	(0.38, 1.33)	0.90	(0.45, 1.79)	0.59	(0.29, 1.23)
	3	0.73	(0.38, 1.41)	0.55	(0.27, 1.09)	0.49	(0.23, 1.03)	0.39	(0.17, 0.85)
	4	0.70	(0.35, 1.39)	0.61	(0.29, 1.25)	0.45	(0.21, 0.99)	0.43	(0.19, 0.99)
	5 (most deprived)	0.81	(0.39, 1.67)	0.41	(0.18, 0.93)	0.53	(0.22, 1.25)	0.36	(0.14, 0.93)

Italics indicate variable eligible for stepwise model (P <0.2).

ASAS: assessment in ankylosing spondylitis; ASDAS: ankylosing spondylitis disease activity score; OR: odds ratio; ref: reference category.