Epidemiology and Risk Factors of Tooth Loss among Iranian Adults: Findings from a Large Community-Based Study

Table 4

Age stratified analysis of association between tooth loss¹ and metabolic abnormality, smoking, and gender.

Independent variables	Age ≤ 35; (𝑛=3086)	P value	Age > 35; (𝑛=4807)	P value
	OR (95% CI)^2		OR (95% CI)
Metabolic abnormality^3
Yes	1.57 (0.67–3.68)	0.29	1.29 (1.07–1.59)	0.009
No (ref)^4	1.00		1.00
Smoking habit
Former smoking	3.43 (1.85–5.0)	0.02	1.49 (1.05–2.05)	0.02
Current smoking	4 (1.28–6.74)	<0.0001	5.29 (4.00–6.66)	<0.0001
Nonsmoking (ref)	1.00		1.00
Sex
Male	2.8 (1.43–4.16)	0.002	1.9 (1.5–2.33)	<0.0001
Female (ref)	1.00		1.00

1A binary variable was created for tooth loss: (i) 0–5 lost teeth and (ii) ≥6 lost teeth.
²OR: odd ratio and 95% CI: 95% confidence interval have been obtained from binary logistic regression; the category of 0–5 lost teeth was considered as the reference category.
³“Metabolic abnormality” was considered to be present when a subject's body mass index was ≥30 or he/she reported to have at least one of the following: diabetes mellitus, hypertension, or hyperlipidemia.
⁴Ref: reference category.