Osteocalcin Serum Levels in Gestational Diabetes Mellitus and Their Intrinsic and Extrinsic Determinants: Systematic Review and Meta-Analysis

Table 2

Newcastle-Ottawa scale for case-control studies.

Study		Selection			Definition of controls	Comparability		Exposure			Stars
Author	Year	Is the case definition adequate?	Representativeness of the cases	Selection of controls		Study controls for main outcome	Study controls for additional outcomes	Ascertainment of exposure	Same method of ascertainment for cases and controls	Nonresponse rate
Winhofer	2010										6
Saucedo	2015										7
Tabatabaei	2014										7
Srichomkwun	2015										6