Table 1.

Demographical comparison between AA group and non-AA group

	Gender (M:F)	Age	BMI	Missing teeth	Smoking (Yes:No)	Education (≤ nine yrs: > nine yrs)
AA (n = 169)	130:39	56.2 ± 8.6	25.5 ± 4.1	1.7	99:70	93:76
Non-AA (n = 156)	129:27	54.8 ± 5.0	24.7 ± 3.6	0.5	74:82	35:121
p value	0.196	0.076	0.047*	0.000*	0.044*	0.000*

BMI body mass index. Independent t-test was performed; *: p < 0.05