Table 3.

Comparison of mean number of erupted teeth according to age in boys and girls

Age (months)	Boys			Girls			Total No. of children
	No.	Mean	Standard deviation	No.	Mean	Standard deviation
4–5	33	0.000		19	0.000		52
6	16	0.375	1.0878	21	0.286	0.7171	37
7	16	1.562	1.5478	13	1.769	4.3618	29
8	20	1.800	2.1908	27	1.777	1.7171	47
9	24	2.666	1.9486	19	3.157	1.7404	43
10	20	4.500	2.3056	19	3.526	2.5247	39
11	14	5.928	1.8999	17	4.176	4.7333	31
12	18	5.555	2.4548	18	6.277	4.3899	36
13	12	8.833	3.5632	19	6.210	3.1015	31
14	18	8.444	4.0904	18	6.444	2.3570	36
15	13	11.076	4.6090	19	10.526	3.8495	32
16	15	10.600	4.5481	17	11.058	3.9444	32
17	19	14.368	4.7866	18	12.388	3.5502	37
18	15	14.066	2.7115	18	12.388	3.3455	33
19	14	13.357	3.2958	11	13.545	2.8058	25
20	16	14.500	3.1198	11	14.181	3.9450	27
21	14	14.928	3.1977	13	14.923	3.7740	27
22	16	16.562	2.4757	12	15.916	2.7122	28
23	18	17.000	1.9703	18	15.722	2.2959	36
24	12	16.666	1.5570	21	17.809	1.6006	33
25	16	17.750	2.0166	16	18.062	2.4349	32
26	12	18.666	1.8257	13	17.923	1.8466	25
27	18	17.555	3.7764	17	18.588	1.5024	35
28	8	18.750	1.8322	13	18.923	1.3821	21
29	16	19.562	1.0935	14	19.642	0.9287	30
30	17	19.176	1.2862	12	19.833	19.833	29
31	14	19.785	0.5789	10	19.200	1.3984	24
32	13	19.692	1.1094	13	19.846	0.5547	26
33	13	20.000	0.0000	11	19.818	0.6030	24
34	14	18.857	1.8752	8	19.000	1.8516	22
35	11	20.000	0.0000	10	20.000	0.0000	21
36	19	20.000	0.0000	14	20.000	0.0000	33