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. 2009 Jan;11(1):64–76. doi: 10.1093/ntr/ntn012

Figure 1.

Figure 1.

Meta-analysis of association of DRD2 Taq1A1 allele with smoking initiation, smoking persistence, and smoking rate. Meta-analysis indicates marginal evidence for association of the DRD2 Taq1A1 allele with smoking initiation (a) and smoking persistence (b), but not smoking rate (c). In all cases there was evidence of between-study heterogeneity, and analyses within a random-effects framework were consistent with the null hypothesis.