Table 4. Factors associated with having fewer than 20 teeth among professional drivers and white-collar workers using the multiple logistic regression analysis.

		Professional drivers		n=592		White-collar workers		n=328
		OR	95% CI	P values		OR	95% CI	P values
Diabetes mellitus	No	1.00				1.00
	Yes	2.68	1.388–5.173	0.003		0.97	0.300–3.106	0.966
Hypertension	No	1.00				1.00
	Yes	1.31	0.790–2.160	0.298		0.93	0.359–2.419	0.884
Hypercholesterolemia	No	1.00				1.00
	Yes	0.93	0.468–1.857	0.842		1.37	0.411–4.553	0.610
Frequency of eating breakfast on weekdays	Every day	1.00				1.00
	Not every day	2.23	1.416–3.513	0.001		0.93	0.391–2.228	0.877
Frequency of eating out on weekdays	Never	1.00				1.00
	1 time and more per week	1.70	1.086–2.671	0.020		1.78	0.842–3.790	0.131
Smoking status	Non-smokers	1.00				1.00
	Smokers+ever smokers	2.88	1.388–5.964	0.004		2.81	1.083–7.300	0.034
Frequency of daily brushing	<2	1.00				1.00
	≥2	1.00	0.619–1.626	0.991		2.30	0.935–5.640	0.070
Duration of brushing teeth	≥3 minutes	1.00				1.00
	<3 minutes	1.66	1.066–2.572	0.025		0.51	0.248–1.057	0.070
Brushing teeth after eating breakfast	Yes	1.00				1.00
	No	1.34	0.832–2.152	0.229		2.43	1.054–5.617	0.037
Brushing teeth after eating dinner	Yes	1.00				1.00
	No	1.58	0.840–2.955	0.156		0.65	0.259–1.646	0.366

Age, annual family income, working hours, shift work, duration of employment, and night shift were included as adjustment factors in the model.