Table 2.

The results of subgroup analysis.

Index	Subgroup	No. of Trials	Mean Difference		p	I2 (%)	p Value of Heterogeneity
			Mean	95%CI
FBG	Cinnamon dose (mg/d)
	≥1200	8	−2.09	−10.34, 6.16	0.620	76.3	0.001
	≤1200	5	−10.05	−18.07, −2.93	0.007	29.6	0.224
	Duration of the trial (week)
	≥8	8	−6.56	−17.32, 4.19	0.232	78.2	0.001
	≤8	5	−3.23	−10.31, 3.85	0.371	60.2	0.004