Table 4.

Associations between selected independent variables and knowledge of systemic diseases (dependent variable) as causative factors for dental erosion (logistic regression)

Independent variables	Adjusted
	OR (95 % CI)	P-value
Sex
Male	1.08 (0.68 – 1.72)	0.73
Female (Ref.)
Age
≤35 years	2.71 (1.14 – 6.46)	0.024
≥36 years (Ref.)
Nationality
Yemeni	0.69 (0.35 – 1.35)	0.28
Foreign (Ref.)
University
Yemeni	0.71 (0.33 – 1.52)	0.39
Foreign (Ref.)
Referral
Yes	0.78 (0.41 – 1.50)	0.47
No (Ref.)