. 2019 Apr 18;51(2):340–344. [Article in Chinese] doi: 10.19723/j.issn.1671-167X.2019.02.026

1.

受试者基线时的基本情况(x±s)

Background of the study subjects at baseline (x±s)

Items	Potassium nitrate group(n=48)	Stannous fluoride group(n=45)	Placebo group(n=46)	P
a, ANOVA; b, chi-square test; VAS, visual analog scale.
Age/years^a	26.51 $\pm$ 5.43	28.14 $\pm$ 4.22	24.53 $\pm$ 4.87	0.64
Male,n(%)^b	13(27.08)	16(35.56)	10(21.74)	0.34
VAS values^a	1.35 $\pm$ 0.56	2.10 $\pm 0.25$	1.78 $\pm$ 0.34	0.75