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Table 1 Characteristics of included studies

From: Correlation of low serum vitamin-D with uterine leiomyoma: a systematic review and meta-analysis

Authors Publication year Country Sample size (Case/Control) Study design Method of vitamin d assay Age group (Control vs. case) Quality assessment
(score)
Reference
Paffoni et al 2013 Italy 128/256 Case-control study chemiluminescence 37.8 ± 3.1, 37.8 ± 3.1 8 [21]
Sabry et al 2013 Egypt 104/50 Cross-sectional study radioimmunoassay 36.8 ± 3.4, 37.1 ± 2.9 8 [25]
Ciebiera et al 2016 Poland 105/83 Cohort study ELISA 42.4 ± 11.2, 42.9 ± 8.1 7 [27]
Ingala et al 2016 Congo 216/216 Case-control study immunoradiometric assay (= radioimmunoassay) 37.20 ± 12.36, 37.78 ± 8.22 8 [22]
Dawood et al 2017 Iraq 34/30 Case-control study ELISA 40–50 8 [24]
Oskovi Kaplan et al 2017 Turkey 56/68 Cross-sectional study electrochemiluminescence immunoassay (ECLIA) 39.84 ± 3.99, 38.25 ± 4.88 8 [14]
Ajmani et al 2018 India 75/75 Case-control studya chemiluminescence assay 38.6 ± 7.78, 36.79 ± 8.97 5 [23]
Singh et al 2018 India 72/72 Cross-sectional study chemiluminescence immunoassay 42.18 ± 5.37, 41.79 ± 4.91 4 [26]
Srivastava et al 2019 India 45/45 Cross-sectional study Chemiluminescence 38.47 ± 6.23, 38.27 ± 5.93 5 [13]
  1. astudy design perceived from methods