Table 1.

Tooth loss status distribution of 35–44 years adults in Guangdong Province by residence areas, sex

Year of surveys	Variable		N	MT > 0		MT
				N (%)	P valuea	$\overline{\text{x}}\pm \text{s}$	P-valueb
Year of surveys: 1995	Total		400	163 (40.7)		0.94 ± 1.64
	Residence	Urban	200	74 (37.0)	0.127	0.68 ± 1.14	0.019*
		Rural	200	89 (44.5)		1.21 ± 1.99
	Sex	Male	203	74 (36.5)	0.076	0.85 ± 1.67	0.083
		Female	197	89 (45.2)		1.04 ± 1.62
Year of surveys: 2005	Total		720	309 (42.9)		0.99 ± 1.75
	Residence	Urban	361	152 (42.1)	0.659	0.97 ± 1.68	0.694
		Rural	359	157 (43.7)		1.00 ± 1.82
	Sex	Male	359	139 (38.7)	0.023*	0.89 ± 1.77	0.010*
		Female	361	170 (47.1)		1.09 ± 1.74
Year of surveys: 2015	Total		288	96 (33.3)		0.63 ± 1.13
	Residence	Urban	144	38 (26.4)	0.009*	0.51 ± 1.03	0.023*
		Rural	144	59 (41.0)		0.74 ± 1.21
	Sex	Male	158	42 (26.6)	0.005*	0.47 ± 0.99	0.003*
		Female	130	55 (42.3)		0.83 ± 1.25

^aChi-squared test

^bWilcoxon rank-sum test

*Statistical significance p < 0.05