Sustained improvements in EQ-5D utility scores and self-rated health status in patients with ankylosing spondylitis after spa treatment including low-dose radon – an analysis of prospective radon indication registry data

Table 1 Characteristics of study population at baseline and directly, 3, 6 & 9 months after spa-treatment including radon

	Baseline^a	Time after intervention
	Baseline^a	directly	3 months	6 months	9 months
Age, mean (SD); range	51.80 (10.14); 19.00–79.00
Women, n (%)	128 (44.00)
Body mass index, mean (SD); range	26.37 (4.25); 18.37–39.56
EQ-5D utility index¹, mean (SD); range	0.79 (0.17); 0.01–1.00	0.88 (0.11); 0.36–1.00	0.87 (0.12); 0.24–1.00	0.85 (0.13); 0.19–1.00	0.83 (0.16); 0.08–1.00
EQ-VAS², mean (SD); range	62.51 (18.01); 15.00–100.00	74.88 (17.10); 2.00–100.00	74.76 (15.41) 20.00–100.00	71.46 (15.52) 18.00–98.00	67.23 (18.00) 20.00–100.00
Clinically relevant improvement EQ-5D utility index³, n (%)		164 (56.36)	160 (54.98)	130 (44.67)	107 (36.77)
Clinically relevant improvement EQ-VAS³, n (%)		207 (70.10)	191 (65.64)	170 (58.42)	139 (47.77)

^adirectly before intervention
¹von Neumann-Morgenstern utility value for current health based on 5 dimensions of EuroQol (i.e. mobility, self-care, usual activities, pain/discomfort, and anxiety/depression), range 0–1 (i.e. 0 = death, 1 = perfect health)
²self-rated health status on a graduated (0–100) scale, 0 = ‘The worst health you can imagine’, 100 = ‘The best health you can imagine’
³clinically relevant improvement. ≥ 0.05 for EQ-5D utility index and ≥ 5.00 for EQ-VAS)

ISSN: 1471-2474