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Table 1 Mean and standard deviation of OM score, H2S, CH3CH and (CH3)2S

From: A randomized double blind crossover placebo-controlled clinical trial to assess the effects of a mouthwash containing chlorine dioxide on oral malodor

      time(min.)
    baseline just after rinsing 30 60 90 120 150 180 210 240
OM score Exp. (n = 15) mean (SD) 2.10 (0.51) 1.23** (0.32) 1.20** (0.32) 1.37** (0.40) 1.33** (0.45) 1.40** (0.39) 1.46** (0.32) 1.43** (0.42) 1.47** (0.48) 1.50** (0.42)
  Cont. (n = 15) mean (SD) 1.87 (0.61) 1.70 (0.53) 1.90 (0.43) 1.90 (0.60) 2.00 (0.57) 2.00 (0.53) 2.11 (0.60) 2.00 (0.50) 2.03 (0.44) 1.93 (0.50)
H2S (ng/10ml) Exp. (n = 15) mean (SD) 5.31 (4.89) 0.12** (0.28) 0.88** (1.28) 1.62** (2.43) 1.17** (1.11) 1.29** (1.12) 1.18** (0.84) 1.72* (1.39) 1.67** (1.05) 1.84* (1.62)
  Cont. (n = 15) mean (SD) 4.88 (6.61) 3.70 (7.24) 3.30 (3.83) 3.34 (3.36) 3.74 (3.89) 4.79 (4.67) 6.45 (8.36) 4.99 (4.65) 4.49 (4.65) 6.77 (5.96)
CH3SH (ng/10ml) Exp. (n = 15) mean (SD) 1.42 (1.48) 0.04** (0.08) 0.14** (0.20) 0.28** (0.31) 0.27** (0.23) 0.27** (0.24) 0.21** (0.17) 0.32* (0.28) 0.30* (0.23) 0.30* (0.28)
  Cont. (n = 15) mean (SD) 1.21 (1.45) 0.61* (0.81) 0.80 (0.70) 0.94 (0.79) 1.07 (0.93) 1.40 (1.28) 1.78 (1.76) 1.58 (1.49) 1.45 (1.50) 2.03* (1.51)
(CH3)2S (ng/10ml) Exp. (n = 15) mean (SD) 0.40 (0.27) 0.02** (0.06) 0.05** (0.20) 0.10** (0.16) 0.09** (0.13) 0.12** (0.14) 0.10** (0.12) 0.12** (0.16) 0.13** (0.12) 0.10** (0.12)
  Cont. (n = 15) mean (SD) 0.33 (0.33) 0.22* (0.21) 0.28 (0.26) 0.29 (0.25) 0.34* (0.30) 0.46 (0.35) 0.52 (0.39) 0.43 (0.40) 0.42 (0.38) 0.53** (0.40)
  1. OM, organoleptic measurement; H2S, hydrogen sulfide; CH3SH, methyl mercaptan; (CH3)2S, dimethyl sulfide; Exp., experimental group; Cont., control group; SD, standard deviation. *, p < 0.05; **, p < 0.01 conparision with the baseline (before rinsing) value. Paired t-test was used for statistical analysis.