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Table 1 Characteristics of AS patients and population controls

From: Restrictive pulmonary function is more prevalent in patients with ankylosing spondylitis than in matched population controls and is associated with impaired spinal mobility: a comparative study

Characteristics AS Patients (n= 147) Controls (n= 121) P-value
Age (yr) median (range) 48.5 (30 to 70) 56.0 (30 to 70) 0.01a
Male n (%) 93 (63.3) 68 (56.2) 0.24d
Height (cm), mean (SD) 174.1 (9.7) 173.4 (8.9) 0.54b
Weight (kg) mean (SD) 77.4 (13.7) 77.5 (13.7) 0.98b
BMI (kg/cm2) mean (SD) 25.5 (3.5) 25.7 (3.7) 0.59b
ASDAS n (%)   -  
< 1.3 (low) 23 (15.6)   
1.3 to 2.1 (moderate) 45 (30.6)   
2.1 to 3.5 (high) 58 (39.5)   
> 3.5 (very high) 10 (10.9)   
BASFI 2.1 (0 to 10) 0.3 (0 to 6.3) < 0.001a
BASMI 3.3 (1.8) 1.7 (0.9) < 0.001b
CRP 3.0 (1.57) 1.0 (1.103) < 0.001a
ESR 16.5 (1.90) 8.0 (1.70) < 0.001a
VO2peak (ml/kg/min) 39.4 (8.0) 40.4 (7.5) 0.002e
Smoking    
   Lifelong non-smoker, n (%) 74 (50.0) 59 (48.8) 0.81c
   Ex-smoker, n (%) 48 (32.4) 38.2 (30.6)  
   Current smoker, n (%) 26 (17.6) 22.9 (20.7)  
> 12 yr education, n (%) 103 (71) 68 (57) 0.03d
Currently employed, n (%) 111 (76.6) 99 (83.2) 0.18d
Social security benefit, n (%) 57 (39.4) 15 (12.6) < 0.001d
Married/living with partner, n (%) 99 (67) 71 (60) 0.20d
Anti-TNF-alpha medication 32 (22) -  
  1. a Mann Whitney U test, bIndependent Sample t-test, cChi Square test, d Chi Square test with correction for continuity (2 × 2 table), eANCOVA adjusted for age and education.