Additional file 2.

Graphs showing an example of relative risk with contributions from different exposure categories (gene-environment interaction). Representative graphs illustrating the interaction between GSTP1 341C/C+T/T genotype with wood/charcoal (graph A) and the interaction between GSTM1*0/*0 genotype with smoking (graph B). In both graphs, U represents is the reference baseline exposure which is GSTP1 341C/C genotype + none exposure to wood/charcoal in graph A; and GSTM1*1/*1 + being non-smoker in graph B. Calculations done according to according to Andersson et al.[39].

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Li et al. BMC Genetics 2010 11:47   doi:10.1186/1471-2156-11-47