BMC Pregnancy and Childbirth

Table 1 Quality assessment of studies using the Newcastle Ottawa scale (NOS) for case‒control studies

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

Author (Year)	Rating									Score
	Selection				Comparability		Exposure/outcome
	Adequate case definition	Representation of cases	Selection of controls	Definition of controls	Cases and control	Additional factor	Ascertainment of exposure	methods of ascertainment	Non -response rate
Rezende et al (2012) [28]	+	+		+	+		+	+		6
Zhan et al (2015) [29]	+	+	+	+	+	+	+	+		8
Rezavand et al (2018) [46]	+	+		+	+		+			5
Farajian-Mashhadi et al. (2019) [31]	+	+	+	+	+		+			6
Ghorbani et al (2020) [47]	+		+	+	+		+			5
Caccamo et al (2020) [48]	+	+	+	+	+	+	+	+		8
Magielda-stola et al (2021) [30]	+	+	+	+	+	+	+			7
Setiarsih et al (2022) [36]	+	+	+	+	+		+			6
Aziz et al (2023) [49]	+	+	+	+	+		+	+		7

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