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Table 2 DMFS outcome data at baseline and change in DMFS during the follow-up period for each tobacco group and residential-area household purchasing power group, 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

% low household purchasing power Tobacco group DMFS baseline 16 years Change in DMFS, 16–19 years  
   N Mean SiC* CF† N ΔMean ΔSiC ΔDMFS>0%‡ p-value§
< 10 Ever users 152 2.5 7.6 41.4 152 1.3 4.2 43.4 0.02
Never users 1553 1.7 6.5 49.8 1553 0.9 3.7 34.8
10-19.9 Ever users 382 3.3 7.3 30.1 382 1.6 4.2 51.8 < 0.001
Never users 2295 2.4 6.8 38.1 2295 1.0 3.8 38.2
20-29.9 Ever users 755 3.9 8.0 27.3 755 1.8 4.6 56.7 < 0.001
Never users 3826 3.0 7.8 35.8 3826 1.5 4.4 43.0
30+ Ever users 162 4.4 8.9 27.8 162 2.3 5.0 59.3 < 0.001
  Never users 892 3.7 8.8 32.2 892 1.5 4.6 46.0  
  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).