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Table 2 Comparison of the relative amounts of tested bacteria with DMFT index in the caries-active and caries-free groups by using Kruskal–Wallis and Mann–Whitney U tests

From: Correlation between dental caries experience and the level of Streptococcus mutans and lactobacilli in saliva and carious teeth in a Yemeni adult population

  Caries-active Caries-free p CF saliva CA saliva Caries tissue p
Median Median
SM 4.1 × 106 4.9 × 106 0.001*a 4.4 4.6 × 106 4.4 × 106 0.006*b
LBs 3.3 × 106 3.5 × 106 0.000*a 3.3 3.2 × 106 3.3 × 106 0.001*b
DMFT 8.0 0 0.000*a 0 9.0 0.000*b
CF saliva     0.000*c 0.000*c  
CA saliva     0.016*d 1.000  
Carious tissue     0.004*e 1.000  
  SM LB DMFT     
Decayed 0.001*f 0.000*f 0.000*g     
Missing 0.620 0.275 0.016*g     
Filled 0.174 0.194 0.032*g     
  1. * p < 0.05, aSM, LBs, and DMFT score in caries-active and caries-free subjects; bSM, LBs, and DMFT score in the three types of samples (caries-free saliva, caries-active saliva, and carious tissue); cdifference between samples in relation to DMFT score; ddifference between samples in relation to SM and eto LBs, f, gdecayed, missing, and filled in relation to SM, LBs, and DMFT score