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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).