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Table 2 Cumulative incidence and relative risk of developing dental caries in the first permanent molars 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 Adjusted HR* (95% CI) P value
N Case Cumulative incidence of caries (%) N Case Cumulative incidence of caries (%)
Sex
 Male 2515 315 12.5 2434 522 21.4 0.59 (0.51–0.68) < 0.001
 Female 2307 387 16.8 1962 499 25.4 0.66 (0.58–0.76) < 0.001
District area
 Urban 4107 581 14.1 3608 787 21.8 0.65 (0.58–0.72) < 0.001
 Rural 715 121 16.9 788 234 29.7 0.56 (0.45–0.70) < 0.001
Total 4822 702 14.6 4396 1021 23.2 0.63 (0.57–0.69) < 0.001
  1. FPMs = first permanent molars, HR = hazard ratio, CI = confidence interval. * using Cox model, adjusting for children sex and district area appropriately