Table 2. Meta-analysis comparing the between dental age using Demirjian’s method and chronological age (in years) among boys.

Subgroups	No. of study	No. of subjects	WMD	95%CI	P value	Ph	Power
Ethnicity
Asian	10	2,352	0.28	(0.19, 0.37)	<0.001	0.013	1.000
Caucasian	15	2,956	0.38	(0.09, 0.68)	0.011	<0.001	1.000
Age groups
5-5.9 y.o.	3	31	1.97	(1.28, 2.65)	<0.001	<0.001	0.153
6-6.9 y.o.	5	76	1.38	(1.01, 1.76)	<0.001	<0.001	0.586
7-7.9 y.o.	8	211	1.42	(1.20, 1.64)	<0.001	0.022	0.946
8-8.9 y.o.	8	292	0.77	(0.60, 0.94)	<0.001	<0.001	1.000
9-9.9 y.o.	8	252	0.85	(0.66, 1.04)	<0.001	<0.001	1.000
10-10.9 y.o.	8	349	0.93	(0.77, 1.09)	<0.001	<0.001	1.000
11-11.9 y.o.	10	334	0.92	(0.76, 1.09)	<0.001	<0.001	1.000
12-12.9 y.o.	10	420	0.94	(0.80, 1.09)	<0.001	<0.001	1.000
13-13.9 y.o.	8	334	0.78	(0.61, 0.94)	<0.001	<0.001	1.000
14-14.9 y.o.	7	180	0.85	(0.62, 1.07)	<0.001	0.002	1.000
15-15.9 y.o.	4	78	0.00	(-0.33, 0.32)	0.978	0.456	1.000
16-16.9 y.o.	2	35	-1.66	(-2.21, -1.11)	<0.001	<0.001	0.220
Overall	25	5,308	0.35	(0.17, 0.52)	<0.001	<0.001	1.000