Effect of Metformin Intervention during Pregnancy on the Gestational Diabetes Mellitus in Women with Polycystic Ovary Syndrome: A Systematic Review and Meta-Analysis

Table 3

Quality of the randomized controlled trials.

Number	Country	Allocation concealment	Blinding	ITT
		A: adequate	A: investigators
		B: unclear	B: patients
		C: inadequate	C: outcome assessors
22	Norway; (2 RCTs)	A	A: Yes; B: Yes; C: No	Yes
26	Norway; (multicenter study)	A	A: Yes; B: Yes; C: Yes	No
30	Norway	A	A: Yes; B: Yes; C: Not reported	No
32	Norway	A	A: Yes; B: Yes; C: Not reported	No
35	Norway	A	A: Yes; B: Yes; C: Not reported	No

ITT: intention-to-treat.