Table 1

Demographic and clinical characteristics of the ankylosing spondylitis patients at baseline

Variable

All patients (n = 180)

Biomarker study (n = 157)

Age (years)

48.7 (37.0 to 56.5)

49.05 (38.3 to 57.7)

Duration (years)

18.0 (10.0 to 31.0)

18.0 (11.0 to 31.0)

Male

147/180 (81.7%)

130/157 (82.8%)

CRP (mg/dl)

7.9 (5.0 to 15.0)

7.0 (5.0 to 15.0)

BASDAI

4.04 (2.29 to 5.77)

4.00 (2.18 to 5.76)

BASFI

3.30 (1.80 to 5.38)

3.33 (1.78 to 5.43)

BASG

4.25 (2.12 to 6.20)

4.10 (2.15 to 6.20)

Ever smoked

106/180 (58.9%)

95/157 (63.8%)

Current smoker

47/180 (26.1%)

40/157 (25.5%)

Values are median (interquartile range) unless otherwise stated. BASDAI, Bath ankylosing spondylitis disease activity index; BASFI, Bath ankylosing spondylitis functional index; BAS-G, Bath ankylosing spondylitis global health; CRP, C-reactive protein.

Mattey et al. Arthritis Research & Therapy 2012 14:R127   doi:10.1186/ar3857