Table 3.

Results of univariate logistic regression analysis of associations by dentition type.

Variables	Primary dentition		Permanent dentition
	OR (95% CI)	p value	OR (95% CI)	p value
Age (year)
7–8	1†	—	1†	—
9–10	0.3 (0.127–0.709)	0.006	1.8 (1.103–2.932)	0.019
11–12	0.049 (0.021–0.111)	<0.001	3.675 (2.219–6.088)	<0.001
Sex
Boy	1†		1†
Girl	0.84 (0.779–1.818)	0.42	1.47 (1.012–2.135)	0.04∗
Resident area
Urban	1†		1†
Rural	1.06 (0.677–1.609)	0.79	2.49 (1.676–3.706)	<0.001∗
Father's occupation
Employee	1†		1†
Not employee	1.40 (0.906–2.183)	0.12	1.53 (1.074–2.254)	0.02∗
Mother's occupation
Housewife	1†		1†
Not housewife	0.93 (0.509–1.733)	0.84	0.76 (0.436–1.328)	0.33
Father's education level
Under complete high school	1†		1†
Complete high school	0.81 (0.490–1.349)	0.42	0.80 (0.465–1.384)	0.42
University	0.91 (0.493–1.696)	o.77	0.54 (0.326–0.924)	0.24
Mother's education level
Under complete high school	1†		1†
Complete high school	0.86 (0.465–1.595)	0.63	0.96 (0.617–1.498)	0.86
University	1.04 (0.575–1.879)	0.89	0.74 (0.434–1.292)	0.29

^†Reference group.