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Table 1 DMFS outcome data at baseline and change in DMFS during the follow-up period for each tobacco group and birth cohort, with p-values for the tobacco group comparisons of change in DMFS

From: Tobacco use and caries risk among adolescents – a longitudinal study in Sweden

Birth cohort Tobacco group DMFS baseline 16 years Change in DMFS, 16–19 years  
   N Mean SiC* CF† N ΔMean ΔSiC ΔDMFS>0%‡ p-value§
1990 Ever users 390 3.7 7.7 27.7 390 1.8 4.2 57.2 < 0.001
Never users 2233 2.9 7.6 35.9 2233 1.3 4.1 43.9
1991 Ever users 342 3.9 8.3 25.4 342 2.0 4.5 57.3 < 0.001
Never users 2191 2.6 7.5 39.4 2191 1.3 4.5 40.9
1992 Ever users 357 3.5 8.0 31.1 357 1.8 4.6 56.0 < 0.001
Never users 2070 2.7 7.6 38.4 2070 1.2 4.1 41.6
1993 Ever users 370 3.5 7.8 33.5 370 1.6 4.6 46.5 < 0.001
Never users 2116 2.5 7.3 41.0 2116 0.9 3.9 35.3
Total Ever users 1459 3.6 7.9 29.5 1459 1.8 4.5 54.2 < 0.001
  Never users 8609 2.7 7.5 38.7 8610 1.2 4.2 40.5  
  1. * Significant caries index based on DMFS.
  2. † Proportion caries-free.
  3. ‡ Proportion with new caries during the observation period (16–19 years).
  4. § P-value from the Wilcoxon-Mann–Whitney test comparing the distributions of DMFS between ever vs. never users.
  5. The overall p-value < 0.0001 (stratified Wilcoxon-Mann–Whitney test).