Table 3. Prevalence of oral diseases.

	Age 6 yr		Age 9 yr		Age 12 yr
Oral status	N	% [95%CI]	N	% [95%CI]	N	% [95%CI]
Caries	744		789		1201
No carious lesion (d3t or D3T = 0)		42.3 [38.8;46.0]		40.1[36.6;43.6]		53.1[50.3;56.0]
At least one carious lesion (d3t or D3T>0)		57.7 [54.0;61.2]		59.9[56.4;63.4]		46.9[44.0;49.7]
Gingival status	731		787		1201
No gingivitis		46.9 [43.3;50.6]		40.4[37.0;43.9]		37.8[35.1;40.6]
Gingivitis on one or more sextants		53.1 [49.4;56.7]		59.6[56.1;63.0]		62.2[59.4;64.9]
Number of posterior Functional units	NI		754		1201
<4 PFU				15.1[12.6;17.9]		2.7[1.9;3.8]
4 to 6 PFU				43.1[39.5;46.7]		17.0[14.9;19.2]
>6 PFU				41.8[38.2;45.4]		80.3[77.9;82.5]
Dental structure of permanent teeth	740		787		1198
No structural defect		85.6[82.8;88.0]		74.6[71.4;77.6]		80.0[77.6;82.2]
At least one structural defect		14.4[12.0;17.2]		25.4[22.4;28.6]		20.0[17.8;22.4]

N: Number; %: Proportion; NI: not investigated; CI: confidence interval.