Prevalence of malocclusions, oral habits and orthodontic treatment need in a 7- to 15-year-old schoolchildren population in Tirana

Progress in Orthodontics

Table 8 Dental health component of the IOTN: prevalence in the total sample ( n = 2,617)

IOTN grade	Number	Percentage	Confidence interval inferior (%)	Confidence interval superior (%)
1	307	11.7	8.1	15.3
2	386	14.7	11.2	18.3
3	847	32.4	29.2	35.5
4	976	37.3	34.3	40.3
5	101	3.9	0.1	7.6
Total	2,617	100.0	100.0	100.0