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Table 4 Comparisons of PF and clinical variables with regard to smoking habits in AS patients

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

Test Lifelong non-smokers(n= 74) Ex-smokers + current smokers (n= 73) P-value
Agea (yr) 47.8 (11.8) 51.1 (10.1) 0.07c
Disease durationb (yr) 21.5 (7 to 55) 23 (8 to 47) 0.64d
Self reported pulmonary disease (yes/no) n (%) 6 (8.1) 10 (13.9) 0.53e
FEV1 (liters)a 3.2 (1.0) 3.0 (0.9) 0.18c
FEV1 %a 89.9 (15.7) 89.6 (16.5) 0.90c
FVC (liters)a 4.1 (1.2) 3.9 (1.1) 0.45c
FVC %a 95.7 (17.4) 98.6 (18.8) 0.33c
PEF (liters/minute)a 469.3 (128.5) 458.8 (114.7) 0.60c
PEF %a 93.6 (18.0) 96.7 (17.1) 0.28c
FEV1/FVC %a 77.5 (7.4) 75.4 (7.6) 0.09c
ASDAS 2.6 (1.0) 3.0 (0.9) 0.004c
BASDAIa 3.8 (2.0) 4.5 (2.0) 0.040c
ESRb 12 (1 to 90) 19 (2 to 67) 0.047d
CRPb 3 (1 to 57) 5 (1 to 52) 0.018d
BASFIb 1.8 (0 to 10) 2.3 (0 to 8.5) 0.66d
BASMIa 3.3 (1.8) 3.2 (1.8) 0.74
Chest expansion (cm)a 4.8 (2.3) 3.9 (2.0) 0.019c
Lumbar flexion (l-Schober)a 4.0 (1.7) 4.0 (1.7) 0.90c
Lumbar lateral flexiona 12.9 (6.0) 13.6 (6.3) 0.53c
Tragus to wall distanceb 13.1 (7.8 to 38.0) 12.0 (8.0 to 43.5) 0.33d
VO2maxa 40.9 (8.4) 38.0 (7.4) 0.037c
Anti-TNF-α-med, n (%) 23 (31) 9 (13) 0.007
Respiratory pattern    
Normal (n) (%) 53 (71.6) 52 (71.2) 1.00e
Restrictive pattern (n) (%) 15 (20.3) 12 (16.4) 0.67e
Obstructive pattern (n) (%) 6 (8.1) 9 (12.3) 0.43e
  1. a Mean (SD). b Median (min-max). c Independent Sample T test. d Mann Whitney U test. e Chi Square test