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Table 1 Baseline measurements for tongue coating and dental plaque samples

From: Effects of tongue cleaning on bacterial flora in tongue coating and dental plaque: a crossover study

  Tongue cleaning Average ± SD p-value*
WTCI (+) 5.53 ± 4.53 0.651
(-) 5.90 ± 3.59  
Total 5.72 ± 4.06  
Wet weight of tongue coating (mg) (+) 15.4 ± 10.1 0.125
(-) 12.0 ± 8.06  
Total 13.6 ± 9.20  
Wet weight of dental plaque (mg) (+) 2.75 ± 7.83 0.375
(-) 1.31 ± 1.42  
Total 2.03 ± 5.63  
Amount of total bacteria in whole tongue coating sample (log pg) (+) 4.76 ± 1.18 0.296
(-) 4.52 ± 1.15  
Total 4.64 ± 1.16  
Amount of total bacteria in whole dental plaque sample (log pg) (+) 4.47 ± 0.79 0.986
(-) 4.47 ± 1.10  
Total 4.46 ± 0.95  
Amount of F. nucleatum in whole tongue coating sample (log pg) (+) 2.19 ± 1.18 0.199
(-) 1.94 ± 1.27  
Total 2.07 ± 1.22  
Amount of F. nucleatum in whole dental plaque sample (log pg) (+) 2.07 ± 1.00 0.664
(-) 1.98 ± 1.23  
Total 2.02 ± 1.11  
Amount of total bacteria in 1 mg of tongue coating (log pg/mg) (+) 3.68 ± 1.02 0.536
(-) 3.56 ± 0.96  
Total 3.62 ± 0.98  
Amount of total bacteria in 1 mg of dental plaque (log pg/mg) (+) 4.51 ± 0.61 0.361
(-) 4.44 ± 0.83  
Total 4.48 ± 0.72  
Amount of F. nucleatum in tongue coating sample (log pg/mg) (+) 1.26 ± 0.93 0.668
(-) 1.13 ± 0.99  
Total 1.20 ± 0.96  
Amount of F. nucleatum in dental plaque sample (log pg/mg) (+) 2.09 ± 0.97 0.343
(-) 1.90 ± 1.06  
Total 2.00 ± 1.01  
  1. *Statistical comparisons between subjects with and without tongue cleaning were performed using a paired t test for WTCI and bacterial amounts. Comparisons of wet weights of samples were performed using a Wilcoxon test, as they were not normally distributed.