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. Author manuscript; available in PMC: 2013 Oct 1.
Published in final edited form as: Neurobiol Aging. 2012 Jul 2;33(10):2528.e1–2528.e6. doi: 10.1016/j.neurobiolaging.2012.06.007

Figure 1. Subgroup analyses of rs2896905 in relation to Parkinson disease according to combined exposure to smoking and caffeine intake.

Figure 1

Low: never smokers with lower than median caffeine intake; Moderate: never smokers with higher than median caffeine intake or ever smokers with lower than median caffeine intake; High: ever smokers with higher than median caffeine intake.