Maternal serum level of resistin is associated with risk for gestational diabetes mellitus: A meta-analysis

Table 2 Quality assessment of the included studies based on scores of Newcastle-Ottawa Scale (case-control study version and cohort version)

Ref.	Case definition adequacy	Representativeness of cases	Selection of controls	Definition of controls	Comparability of cases and controls	Ascertainment of exposure	Same method of ascertainment for cases and controls	Non-response rate	Total quality score
Tsiotra et al[49], 2018	1	0	0	1	1	1	1	NI	5
Lobo et al[42], 2018	1	1	1	1	2	1	1	1	9
Siddiqui et al[25], 2018	1	0	0	1	1	1	1	NI	5
Bagci et al[21], 2018	1	0	0	1	1	1	1	NI	5
Ravnsborg et al[45], 2016	1	1	1	1	2	1	1	1	9
Huang et al[13], 2016	1	0	0	1	2	1	1	NI	6
Takhshid and Zare[48], 2015	1	0	0	1	2	1	1	NI	6
Boyadzhieva et al[32], 2013	1	1	1	1	1	1	1	NI	7
Nanda et al[43], 2012	1	1	0	1	1	1	1	NI	6
Skvarca et al[47], 2012	1	0	0	1	2	1	1	NI	6
Akdeniz et al[31], 2011	1	0	0	1	1	1	1	NI	5
Kleiblova et al[38], 2010	1	0	0	1	1	1	1	NI	5
Vitoratos et al[50], 2010	1	0	0	1	2	1	1	NI	6
Kralisch et al[39], 2009	1	0	0	1	2	1	1	NI	6
Kuzmicki et al[14], 2009	1	0	0	1	2	1	1	NI	6
Palik et al[17], 2007	1	0	0	1	1	1	1	NI	5
Ref.	Representativeness of the exposed cohort	Selection of the non-exposed cohort	Ascertainment of exposure	Demonstration that outcome of interest was not present at start of study	Comparability of cohorts	Assessment of outcome	Follow-up long enough for outcomes to occur	Adequacy of follow -up of cohorts	Total quality score
Khanam et al[37], 2017	0	1	1	1	2	1	1	0	7
Vitoratos et al[18], 2011	0	1	1	1	2	1	1	1	8

NI: No information.