Table 3.

Binary status based on the median number of existing teeth in the age groups by demographic, socioeconomic factors among the participants aged 55–79 years.

Variables	Contents	Total n	≤Median		>Median		p *
			n	%	n	%
	Total	3255	1690	53.6	1565	46.4
Gender	Male	1516	821	56.0	695	44.0	0.016
	Female	1739	869	51.3	870	48.7
Household income	Low	906	516	60.2	390	39.8	<0.001
	Middle-low	910	480	54.9	430	45.1
	Middle-high	725	368	51.4	357	48.6
	High	714	326	47.2	388	52.8
Educational level	≤Primary	1289	734	59.2	555	40.8	<0.001
	Middle	589	321	55.6	268	44.4
	High	839	419	51.8	420	48.2
	≥College	538	216	42.7	322	57.3
Educational level of father	Uneducated	873	495	58.4	378	41.6	0.003
	Primary	1588	836	54.0	752	46.0
	Middle	317	142	47.0	175	53.0
	≥High	477	217	48.6	260	51.4
Educational level of mother	Uneducated	1561	836	55.1	725	44.9	0.089
	Primary	1356	703	53.9	653	46.1
	Middle	193	81	46.0	112	54.0
	≥High	145	70	47.3	75	52.7
Region of residence	Urban	2492	1239	51.5	1253	48.5	<0.001
	Rural	763	451	61.0	312	39.0
National Health insurance	Workplace	2037	1040	52.8	997	47.2	0.134
	Regional	1114	581	54.0	533	46.0
	Medicaid	104	69	65.9	35	34.1

* p-value was calculated by complex samples cross tables.