Table 5. Logistic regression of broad-spectrum antibiotic prescription after tooth extraction.

Division	B	SE	β	OR	CI	P-value
Intercept	0.034	0.020				0.083
Sex (male=1)
Female	−0.017	0.006	−0.005	0.983	0.971-0.995	0.007
Age (yr) (19-30 yr=1)
31-40	0.065	0.012	0.012	1.067	1.042-1.093	<0.001
41-50	0.091	0.012	0.019	1.095	1.070-1.120	<0.001
51-60	0.121	0.011	0.028	1.129	1.104-1.154	<0.001
61-70	0.141	0.012	0.028	1.152	1.125-1.180	<0.001
≥71	0.110	0.013	0.021	1.116	1.088-1.145	<0.001
Household income (low=1)
Medium-low	−0.022	0.011	−0.004	0.979	0.958-1.000	0.054
Medium	−0.018	0.011	−0.004	0.982	0.961-1.002	0.084
Medium-high	−0.033	0.010	−0.008	0.968	0.948-0.987	0.001
High	−0.030	0.010	−0.007	0.971	0.952-0.990	0.003
Type of dental institution (dental hospital=1)
Dental clinic	−0.525	0.011	−0.085	0.592	0.579-0.605	<0.001
Region of dental institution (urban=1)
Rural	0.100	0.011	0.016	1.105	1.082-1.128	<0.001
Year of prescription (2011=1)
2012	−0.036	0.010	−0.008	0.964	0.945-0.984	<0.001
2013	0.044	0.010	0.010	1.045	1.025-1.066	<0.001
2014	0.221	0.010	0.049	1.247	1.223-1.272	<0.001
2015	0.351	0.010	0.079	1.420	1.393-1.448	<0.001
Type of tooth extraction (incisor extraction=1)
Molar extraction	0.027	0.010	0.007	1.027	1.007-1.048	0.009
Complicated extraction1	0.181	0.014	0.030	1.198	1.167-1.231	<0.001
Simply impacted tooth	0.207	0.021	0.021	1.230	1.181-1.280	<0.001
Complexly impacted tooth2	0.315	0.020	0.034	1.370	1.318-1.425	<0.001
Completely impacted tooth3	0.509	0.019	0.063	1.664	1.604-1.725	<0.001

(B: unstandardized beta, SE: standardized error, β: standardized beta, OR: odds ratio, CI: confidence interval)

¹Cases where simple extraction was not possible due to root hypertrophy, root dilacerations, or osseointegration.

²Cases involving tooth splitting.

³Simultaneous tooth splitting and ostectomy of impacted tooth with ≥2/3 of crown impacted into alveolar bone.

P-value calculated by logistic regression analysis.

Variables removed on the model: diabetes mellitus and hypertension.