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Table 2 Comparisona of outcomes based on surfaces

From: Long-term clinical and bacterial effects of xylitol on patients with fixed orthodontic appliances

Variables From baseline to Group
Gum Mint Control
Z P value Z P value Z P value
Plaque 3rd month −3.274b 0.001 −3.611b 0 −3.123b 0.002
6th month −0.423b 0.672 −0.570b 0.568 −2.600b 0.009
12th month −1.890b 0.059 −0.756b 0.45 −2.646b 0.008
Plaque MS counts 3rd month −1.763b 0.078 −2.313b 0.021 −2.979b 0.003
6th month −1.500b 0.134 −2.786b 0.005 −2.938b 0.003
12th month −2.082b 0.037 −1.877b 0.061 −3.002b 0.003
Salivary MS counts 3rd month −0.351c 0.725 −1.421b 0.155 −1.265b 0.206
6th month −0.531b 0.595 −0.816c 0.414 −0.216c 0.829
12th month −1.342c 0.18 −0.879c 0.38 0.000d 1
  1. aWilcoxon Signed-Rank Test
  2. bBased on positive ranks (decreased score)
  3. cBased on negative ranks (increased score)
  4. dThe sum of negative ranks equals the sum of positive ranks (no change)