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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