Table 3. Multinomial analysis of the association between the severity of the IDTs and age group, number of teeth involved and etiology.

Severity	Variables		p value	OR (95% CI)
Moderate	Age range	≤ 14 y	ref	ref
		15 ~ 25 y	0.045	1.66 (1.012 - 2.723)
		≥ 26 y	0.002	2.41 (1.368 - 4.273)
	Number of teeth involved	1 or 2	ref	ref
		≥ 3	0.011	1.85 (1.152 - 2.983)
	Etiology	Fall from standing height	ref	ref
		Fall by bicycle + Sports	0.790	0.93 (0.564 - 1.545)
		Traffic + Others	0.972	0.99 (0.588 - 1.669)
Severe	Age range	≤ 14 y	ref	ref
		15 ~ 25 y	0.425	1.18 (0.778 - 1.816)
		≥ 26 y	0.071	1.59 (0.962 - 2.639)
	Number of teeth involved	1 or 2	ref	ref
		≥ 3	0.000	4.64 (3.110- 6.931)
	Etiology	Fall from standing height	ref	ref
		Fall by bicycle + Sports	0.050	1.51 (1.00 - 2.321)
		Traffic + Others	0.012	1.78 (1.135 - 2.795)