From: The anticaries effects of pit and fissure sealant in the first permanent molars of school-age children from Guangzhou: a population-based cohort study
Variable
Sealant group
Control group
P value
N = 4822(%)
N = 4396(%)
Sex
Female
2515(52.2)
2434(55.4)
> 0.05
Male
2307(47.8)
1962(44.6)
District area
Urban
4107(85.2)
3608(82.1)
Rural
715(14.8)
788(17.9)
Total
4822
4396