Table 7. Final multiple linear regression model for the outcome “perspective on the causes of tooth discoloration”.

	β coefficient	t	p
Intercept a	0.332	3.11	0.002
Age group:
20-29 vs. 70+	0.263	2.46	0.014
30-39 vs. 70+	0.296	2.77	0.006
40-49 vs. 70+	0.275	2.55	0.011
50-59 vs. 70+	0.295	2.71	0.007
60-69 vs. 70+	0.278	2.50	0.013
Undergraduate Institution:
Public vs. Private	0.108	4.17	< .001
X vs. Private	-0.219	-1.32	0.188
Stricto Sensu - Operative Dentistry, Pediatric Dentistry, or Orofacial Harmonization? Yes vs. No	0.140	4.58	< .001

^a Represents the reference level