Table 1.

Caries status of 140 children of both genders over two years.

Examination	Gender	Number of participants	Number of caries cases	Caries prevalence (%)	χ 2	P	dmft ($\overline{x}\pm s$)	Z	P	dmfs ($\overline{x}\pm s$)	Z	P	CSI ($\overline{x}\pm s$)	Z	P
Initial exam	Boy	70	28	40.00	2.03	>0.05	1.46 ± 2.18	1.00	>0.05	2.07 ± 4.28	0.92	>0.05	4.23 ± 6.54	0.99	>0.05
	Girl	70	20	28.57			1.50 ± 2.91			2.39 ± 5.40			5.20 ± 11.14
	Total	140	48	34.29			1.48 ± 2.56			2.23 ± 4.86			4.71 ± 9.11
Follow-up exam after two years	Boy	70	46	65.71	0.03	>0.05	3.73 ± 4.11	−0.10	>0.05	5.93 ± 7.60	−0.10	>0.05	11.43 ± 14.19	−0.17	>0.05
	Girl	70	47	67.14			3.90 ± 4.39			6.23 ± 8.29			12.30 ± 15.82
	Total	140	93	66.43			3.81 ± 4.24			6.08 ± 7.93			11.87 ± 14.98
Increase over two years	Boy	70	18	25.71	2.65	>0.05	2.27 ± 2.83	−0.46	>0.05	3.86 ± 5.14	−0.39	>0.05	7.20 ± 9.88	−0.41	>0.05
	Girl	70	27	38.57			2.40 ± 2.79			3.84 ± 4.85			7.11 ± 8.55
	Total	140	45	32.14			2.34 ± 2.80			3.85 ± 4.98			7.15 ± 9.20