Table 3.

Results of the forest plots for the bone formation grade at the 12-month follow-up

Bone formation grade at the 12-month follow-up	Number of patients	Number of included studies	OR	95% CI	P value	χ2	I2	Effect model
Number of patients with bone formation grade A at 12 months of follow-up	105	2	1.32	0.61, 2.86	0.48	0.49	0%	Random effect
Number of patients with bone formation grade B at 12 months of follow-up	105	2	1.13	0.46, 2.75	0.79	0.33	0%	Random effect
Number of patients with bone formation grade C at 12 months of follow-up	105	2	0.41	0.04, 4.20	0.45	0.07	71%	Random effect