Skip to main content
. Author manuscript; available in PMC: 2010 Aug 1.
Published in final edited form as: Arthritis Rheum. 2009 Aug;60(8):2499–2504. doi: 10.1002/art.24702

Figure 1.

Figure 1

Associations between the annual UV Index in seven U.S. regions and the proportion of patients with dermatomyositis (DM) and anti-Mi-2 autoantibodies in each region. Modeling of these data for all myositis patients based on state of residence showed a non-significant trend for association between the UV index and the logit of the proportion of DM patients (p=0.07, upper left panel), but a significant association with the logit of the proportion of those with anti-Mi-2 autoantibodies (p=0.05, upper right panel). The data suggest that these associations are driven by women (for DM, p=0.014, lower left panel; for anti-Mi-2 autoantibodies, p=0.012, lower right panel). Because no patients with anti-Mi-2 autoantibodies were in the Northwest region, this region is not represented in the right two panels. The size of the circle representing each region is proportional to the number of patients residing in that region at the time of myositis onset.