A plethora of laboratory protocols for vitamin D receptor (VDR) gene variants detection: a systematic review of associations with hypertensive disorders of pregnancy

Table 3 Summary of the studies’ characteristics

First Author (year)	Country	Study design	Study population	Sample size (Case/control)
Rezende et al. (2012) [28]	Brazil	Case‒control	Caucasian	316/213
Zhan et al. (2015) [29]	China	Case‒control	Asian	402/554
Rezavand et al. (2018) [46]	Iran	Case‒control	Asian	100/100
Farajian-Mashhadi et al. (2019) [31]	Iran	Cease-control	Asian	M-152/160 P-121/106
Ghorbani et al. (2020) [47]	Iran	Case‒control	Asian	100/100
Caccamo et al. (2020) [48]	Italy	Case‒control	Caucasian	116/69
Magielda-stola et al. (2021) [30]	Poland	Case‒control	Caucasian	122/184
Setiarsih et al. (2022) [36]	Indonesia	Case‒control	Asian	105/105
Aziz et al. (2023) [49]	Pakistan	Case‒control	Asian	40/40

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