Figure 1.

Fat-free mass for males (a) and females (b) according to pack-year grouping. Data are presented as means with 95% confidence intervals. Pack-year groups: 1, 1 to 9 pack-years; 2, 10 to 19 pack-years; 3, 20 to 34 pack-years; 4, greater than 35 pack-years. Asterisk indicates significant difference compared with group 1 (P < 0.05).

Stavropoulos-Kalinoglou et al. Arthritis Research & Therapy 2008 10:R59   doi:10.1186/ar2429
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