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Table 6 Association between principal component 3 and pack-year category

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

Variable

0 pack years (n= 61

1 to 15 pack years (n= 37)

16 to 30 pack years (n= 17)

> 30 pack years (n= 14)

P(trend)a

PC3

-0.10 (1.80)

0.38 (1.17)

0.79 (1.21)

1.86 (2.51)

< 0.0005

  1. Mean (standard deviation) values are shown. PC, principal component. aLinear test for trend.
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Arthritis Research & Therapy

ISSN: 1478-6362

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