Dental caries experience and determinants in young adults of the Northern State Medical University, Arkhangelsk, North-West Russia: a cross-sectional study

Table 3 Association between the DMFT index and selected determinants in the negative binomial hurdle model

Determinants^a	Logistic regression^b		Zero-truncated negative binomial regression^c
Determinants^a	OR (95% CI)	p-value	IRR (95%CI)	p-value
Age group (years)		0.164		0.031
21–25	0.52 (0.21–1.30)		1.09 (1.01–1.18)
18–20	Reference		Reference
Sex				0.037
Female			1.10 (1.01–1.20)
Male			Reference
Faculty				0.283
Dental			0.95 (0.88–1.04)
Medical			Reference
Eligible for free education				0.172
No			0.93 (0.83–1.03)
Yes			Reference
Subjective SES				0.015
6.0 and more			1.11 (1.02–1.21)
Less than 6.0			Reference
Accommodation		0.361
Hostel	0.65 (0.25–1.64)
Flat or house	Reference
Mother’s education		0.093		0.287
University	1.99 (0.89–4.42)		1.04 (0.96–1.13)
Lower than university	Reference		Reference
Skipping tooth-brushing		0.061		0.047
Yes	0.41 (0.16–1.04)		1.09 (1.00–1.19)
No	Reference		Reference
Toothpaste		0.143		0.117
With fluoride	0.56 (0.26–1.22)		0.94 (0.87–1.02)
Without fluoride or difficult to answer	Reference		Reference
Regularity of dental visits		0.013		<0.001
Regularly	0.38 (0.18–0.82)		1.22 (1.10–1.36)
Not regularly	Reference		Reference

Abbreviations: DMFT Decayed Missing and Filled Permanent Teeth, IRR incidence rate ratio, CI confidence interval, OR odds ratio, SES socioeconomic status
^aAccommodation was included only in the logistic regression. Sex, Faculty, Eligible for free education, and Subjective SES were included only in the zero-truncated negative binominal regression
^bThe dependent variable was whether a student was dental caries-free (coded as 1) or not (coded as 0)
^cThe dependent variable was the count zero-truncated variable (DMFT >0)

ISSN: 1472-6831