Table 2.

The evidence quality for the outcomes (GRADE system).

Outcomes (N)	AWMD (95% CI)	ROB	Inconsistency	Indirectness	Imprecision	Other considerations	Sample size		Evidence quality
							Interventions	Comparison
HbA1c (3)	-0.283 (-0.561, -0.004)	none	none	none	serious	none	203	208	MODERATE ⊕⊕⊕○
FBG (3)	-0.314 (-1.599, 0.972)	none	serious	none	serious	none	203	208	MODERATE ⊕⊕⊕○
2h-PG (3)	-0.152 (-0.778, -0.474)	none	serious	none	serious	none	203	208	MODERATE ⊕⊕⊕○

AWMD, adjusted weighted mean difference; ROB, risk of bias; N, numbers of RCTs; GRADE, Grading of Recommendations Assessment, Development and Evaluation