Correlation between the DAI and ICON indices used for assessment of orthodontic treatment need in Croatian schoolchildren

Figure 1

Figure 2

Distribution of orthodontic treatment need in schoolchildren who were not undergoing orthodontic treatment at the time of the study, with respect to dentition type and previous orthodontic treatment, with the ICON cut-off point of 43_

Dentition type	Previous treatment		ICON cut-off point of 43		Total	p
			No treatment need Treatment needed
Mixed	No	N	264	136	400
		%	66.0	34.0	100.0
	Yes	N	17	11	28	0.545
		%	60.7	39.3	100.0
	Total	N	281	147	428
		%	65.7	34.3	100.0
Permanent	No	N	1115	236	1351
		%	82.5	17.5	100.0
	Yes	N	326	79	405	0.376
		%	80.5	19.5	100.0
	Total	N	1441	315	1756
		%	82.1	17.9	100.0

Distribution of the ICON degrees with cut-off point of 43 between dentition types within the DAI categories (0=Normal, 1=Definite, 2=Severe, 3=Handicapping)_

DAI categories	Dentition type		ICON cut-off point of 43		Total	p Fischer exact test	OR (95% CI)	τ-b
			No treatment need	Treatment needed
0	Mixed	N	179	48	227
		%	78.9	21.1	100.0
	Permanent	N	1265	115	1380
		%	91.7	8.3	100.0	<0.001	2.54(1.87-3.45)	-0.148
	Total	N	1444	163	1607
		%	89.9	10.1	100.0
1	Mixed	N	79	36	115
		%	68.7	31.3	100.0
	Permanent	N	277	94	371	0.228	1.24(0.90-1.71)	-0.057
		%	74.7	25.3	100.0
	Total	N	356	130	486
		%	73.3	26.7	100.0
2	Mixed	N	29	38	67
		%	43.3	56.7	100.0
	Permanent	N	110	68	178
		%	61.8	38.2	100.0	0.014	1.49(1.12-1.97)	-0.167
	Total	N	139	106	245
		%	56.7	43.3	100.0
3	Mixed	N	24	44	68
		%	35.3	64.7	100.0
	Permanent	N	92	99	191
		%	48.2	51.8	100.0	0.088	1.25(0.99-1.56)	-0.114
	Total	N	116	143	259
		%	44.8	55.2	100.0

Distribution of the ICON categories (0=Easy, 1=Mild, 2=Moderate, 3=Difficult, 4=Very Difficult) in schoolchildren who were not undergoing orthodontic treatment at the time of the study, with respect to dentition type and previous orthodontic treatment_

Dentition type	Previous treatment			ICON complexity				Total	p χ2 test
			0	1	2	3	4
Mixed	No	N	143	166	47	23	21	400
		%	35.8	41.5	11.8	5.8	5.3	100.0
	Yes	N	10	10	5	2	1	28
		%	35.7	35.7	17.9	7.1	3.6	100.0	0.870
	Total	N	153	176	52	25	22	428
		%	35.7	41.1	12.1	5.8	5.1	100.0
Permanent	No	N	737	469	72	45	28	1351
		%	54.6	34.7	5.3	3.3	2.1	100.0
	Yes	N	221	129	27	17	11	405	0.561
		%	54.6	31.9	6.7	4.2	2.7	100.0
	Total	N	958	598	99	62	39	1756
		%	54.6	34.1	5.6	3.5	2.2	100.0

Distribution of the DAI categories (0=Normal, 1=Definite, 2=Severe, 3=Handicapping) in schoolchildren who were not undergoing orthodontic treatment at the time of the study, with respect to previous orthodontic treatment_

Dentition type	Previous treatment	ICON complexity					Total	p χ2 test
			0	1	2	3
Mixed	No	N	191	104	54	60	409
		%	46.7	25.4	13.2	14.7	100.0
	Yes	N	18	5	2	3	28
		%	64.3	17.9	7.1	10.7	100.0	0.343
	Total	N	209	109	56	63	437
		%	47.8	24.9	12.8	14.4	100.0
Permanent	No	N	925	243	109	97	1374
		%	67.3	17.7	7.9	7.1	100.0
	Yes	N	265	70	31	48	414
		%	64.0	16.9	7.5	11.6	100.0	0.032
	Total	N	1190	313	140	145	1788
		%	66.6	17.5	7.8	8.1	100.0