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Table 8 Relationship between pack-year category and frequency of AS patients in low and high MMP clusters

From: Association of cytokine and matrix metalloproteinase profiles with disease activity and function in ankylosing spondylitis

Pack years

Low MMP cluster

High MMP cluster

0

46 (73.0)

17 (27.0)

1 to 15

19 (52.8)

17 (47.2)

16 to 30

8 (47.1)

9 (52.9)

> 30

5 (35.7)

9 (64.3)a

  1. Data presented as n (%). AS, ankylosing spondylitis; MMP, matrix metalloproteinase. aP (trend) = 0.001 (Cochrane-Armitage test for trend).
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Arthritis Research & Therapy

ISSN: 1478-6362

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