Figures & data
Figure 1 Study selection process in this meta-analysis.
![Figure 1 Study selection process in this meta-analysis.](/cms/asset/8093f37e-4fa1-4dec-a945-cdbab597e706/dndt_a_156479_f0001_b.jpg)
Table 1 Characteristics of studies that qualified to be included in the meta-analysis
Table 2 Allele frequency of 48 bp VNTR polymorphism
Table 3 Pooled associations of DRD4 polymorphisms and schizophrenia
Table 4 Subgroup associations of DRD4 polymorphisms with schizophrenia
Table 5 Genotype distribution and allele frequency of 12 bp TR
Table 6 Genotype distribution and allele frequency of 120 bp TR
Table 7 Genotype distribution and allele frequency of −521 C>T
Table 8 Genotype distribution and allele frequency of −616 C>G
Table 9 Genotype distribution and allele frequency of −376 C>T
Figure 2 Funnel plot analysis for the detection of publication bias in the association between the 48 bp VNTR (7R vs others) and schizophrenia.
![Figure 2 Funnel plot analysis for the detection of publication bias in the association between the 48 bp VNTR (7R vs others) and schizophrenia.](/cms/asset/df7d2491-bd75-43bd-81a0-b18beb83b077/dndt_a_156479_f0002_c.jpg)
Figure 3 Funnel plot analysis for the detection of publication bias in the association between 48 bp VNTR (L vs S) and schizophrenia.
Abbreviations: OR, odds ratio; VNTR, variable number tandem repeat.
![Figure 3 Funnel plot analysis for the detection of publication bias in the association between 48 bp VNTR (L vs S) and schizophrenia.](/cms/asset/24ed561d-5a08-4474-b1b6-bcf9b136f5dc/dndt_a_156479_f0003_c.jpg)
Figure 4 Funnel plot analysis for the detection of publication bias in the association between 12 bp TR and schizophrenia.
![Figure 4 Funnel plot analysis for the detection of publication bias in the association between 12 bp TR and schizophrenia.](/cms/asset/df6ef49f-0991-4161-8c43-050816484121/dndt_a_156479_f0004_c.jpg)
Figure 5 Funnel plot analysis for the detection of publication bias in the association between 120 bp TR and schizophrenia.
![Figure 5 Funnel plot analysis for the detection of publication bias in the association between 120 bp TR and schizophrenia.](/cms/asset/c92cd941-6890-4d1c-9cef-fda56681d2f2/dndt_a_156479_f0005_c.jpg)
Figure 6 Funnel plot analysis for the detection of publication bias in the association between −521 C>T and schizophrenia.
![Figure 6 Funnel plot analysis for the detection of publication bias in the association between −521 C>T and schizophrenia.](/cms/asset/b3a64302-cbdd-4615-a420-5930aa63cd3c/dndt_a_156479_f0006_c.jpg)
Figure 7 Funnel plot analysis for the detection of publication bias in the association between −616 C>G and schizophrenia.
![Figure 7 Funnel plot analysis for the detection of publication bias in the association between −616 C>G and schizophrenia.](/cms/asset/11c3e9af-3161-4326-857a-904647da92de/dndt_a_156479_f0007_c.jpg)
Figure 8 Funnel plot analysis for the detection of publication bias in the association between −376 C>T and schizophrenia.
![Figure 8 Funnel plot analysis for the detection of publication bias in the association between −376 C>T and schizophrenia.](/cms/asset/77e71e89-bf1f-4835-b95e-6485452b24a8/dndt_a_156479_f0008_b.jpg)