Dental Calculi of Siberian Natives, Russian Settlers, and Korean People of Joseon Dynasty Period in the 16th to 19th Century Eurasia Continent

Table 5

Prevalence of calculus per teeth by sex (Chi-squared test).

	Male			Female			value
	Affected ()	Non-affected ()	Frequency (%)	Affected ()	Nonaffected ()	Frequency (%)
Siberian natives	47	375	11.1	7	391	1.8	^a1.358e-07
Russian settlers	141	424	25.0	154	585	20.8	^a 0.09028
Joseon people	392	720	35.3	256	624	29.1	^a 0.00415

^aChi-squared test.