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Table 3 Mean DMFT in the FPMs and difference between sealant group and control group by sex and area

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

  Sealant group Control group Mean difference* (95%CI) P value
N DMFT DMFT Mean ± SD N DMFT DMFT Mean ± SD
Sex
 Male 2515 431 0.17 ± 0.51# 2434 786 0.32 ± 0.71 −0.15(−0.19 to −0.12) < 0.001
 Female 2307 550 0.24 ± 0.61# 1962 743 0.38 ± 0.75 −0.14(− 0.18 to − 0.10) < 0.001
District area
 Urban 4107 821 0.20 ± 0.56# 3608 1194 0.33 ± 0.72 −0.13(− 0.16 to − 0.10) < 0.001
 Rural 715 160 0.22 ± .56# 788 335 0.43 ± 0.76 −0.20(− 0.27 to − 0.13) < 0.001
Total 4822 981 0.20 ± 0.56 4396 1529 0.35 ± 0.73 −0.14(− 0.17 to − 0.12) < 0.001
  1. FPMs = first permanent molars, CI = confidence interval. * using mixed linear regression analysis, adjusting for children sex and district area appropriately. # compare the difference of mean number DMFT in the FPMs between the sealant group and control group, p< 0.05