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Table 1 Basic information of the original articles included in this meta-analysis

From: The role of vitamin D receptor gene polymorphisms in gestational diabetes mellitus susceptibility: a meta-analysis

Site First author Ethnicity Year Design Methods Case Control
BsmI (rs1544410)       GG AA GA GG AA GA
Qi Juan Asian 2013 HBC PCR–RFLP 0 58 22 0 70 10
Hesham A African 2015 PBC PCR–RFLP 11 61 40 66 40 112
Mahmut Apaydın Caucasian 2019 HBC PCR–RFLP 14 42 44 15 43 76
Selvihan Beysel Caucasian 2019 HBC PCR–RFLP 45 53 63 36 57 52
Beibei Zhu Asian 2019 PBC iMLDR 0 240 34 0 353 27
FokI (rs2228570)       TT CC TC TT CC TC
Hesham A African 2015 PBC PCR–RFLP 34 24 54 65 33 120
Mahmut Apaydın Caucasian 2019 HBC PCR–RFLP 16 41 43 8 80 46
Selvihan Beysel Caucasian 2019 HBC PCR–RFLP 40 76 44 24 78 43
ApaI (rs7975232)       CC AA CA CC AA CA
Hesham A African 2016 HBC PCR–RFLP 25 51 81 9 55 93
Mahmut Apaydın Caucasian 2019 HBC PCR–RFLP 31 17 52 32 26 76
Selvihan Beysel Caucasian 2019 HBC PCR–RFLP 34 48 78 20 52 73
TaqI (rs731236)       CC TT CT CC TT CT
Golzar Rahmannezhad Asian 2016 HBC PCR–RFLP 16 78 63 17 55 85
Mahmut Apaydın Caucasian 2019 HBC PCR–RFLP 14 44 42 14 54 66
Selvihan Beysel Caucasian 2019 HBC PCR–RFLP 42 81 37 30 82 33
Beibei Zhu Asian 2019 PBC iMLDR 8 237 29 21 341 18
  1. PCR—RFLP, polymerase chain reaction—restriction fragment length polymorphism; iMLDR, improved multiple ligase detection reaction; HBC, hospital-based study; PBC, population-based study