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. 2021 Feb 1;9(2):144. doi: 10.3390/healthcare9020144

Table 2.

Means, standard deviations, and two-way ANOVA with repeated measure statistics for study variables.

AV (n = 30) CS (n = 30) ANOVA
Variable M SD M SD Effect F ratio df ηp2
PH between the eyebrows
Baseline 5.19 0.45 5.19 0.52 G 0.05 1, 58 0.00
Week 1 after treatment 5.27 0.40 5.24 0.42 T 1.45 2, 116 0.02
Week 2after treatment 5.28 0.26 5.26 0.18 G × T 0.04 2, 116 0.00
PH around the nose
Baseline 5.26 0.47 5.26 0.47 G 0.61 1, 58 0.01
Week 1 after treatment 5.23 0.29 5.35 0.35 T 0.68 2, 116 0.01
Week 2 after treatment 5.28 0.25 5.34 0.28 G × T 0.98 2, 116 0.02
PH around the bottom lip
Baseline 5.25 0.40 5.27 0.47 G 0.52 1, 58 0.00
Week 1 after treatment 5.20 0.29 5.10 0.31 T 4.19 * 2, 116 0.07
Week 2 after treatment 5.27 0.22 5.19 0.27 G × T 1.18 2, 116 0.02
Oiliness between the eyebrows
Baseline 205.87 33.23 92.73 29.85 G 147.99 *** 1, 58 0.72
Week 1 after treatment 146.60 30.05 91.07 30.45 T 50.93 *** 2, 116 0.47
Week 2 after treatment 141.90 31.02 86.53 17.79 G × T 38.86 *** 2, 116 0.40
Oiliness around the nose
Baseline 193.77 42.12 80.97 37.90 G 68.29 *** 1, 58 0.54
Week 1 after treatment 139.67 45.87 81.30 41.65 T 28.57 *** 2, 116 0.33
Week 2 after treatment 136.63 43.27 82.77 24.06 G × T 30.97 *** 2, 116 0.35
Oiliness around the bottom lip
Baseline 179.87 43.22 76.63 28.73 G 83.17 *** 1, 58 0.59
Week 1 after treatment 140.40 42.18 86.40 37.28 T 11.07 *** 2, 116 0.16
Week 2 after treatment 135.87 38.38 80.63 20.67 G × T 20.25 *** 2, 116 0.26
Moisture between the eyebrows
Baseline 56.37 17.30 62.37 15.07 G 4.20 * 1, 58 0.07
Week 1 after treatment 58.21 16.90 65.59 16.31 T 4.78 ** 2, 116 0.08
Week 2 after treatment 59.71 19.08 70.06 16.78 G x T 0.78 2, 116 0.01
Moisture around the nose
Baseline 35.40 17.76 46.75 23.34 G 10.92 ** 1, 58 0.16
Week 1 after treatment 46.49 20.85 61.92 17.87 T 24.74 *** 2, 116 0.30
Week 2 after treatment 49.28 19.91 64.89 18.45 G × T 0.50 2, 116 0.00
Moisture around the bottom lip
Baseline 63.33 13.71 71.00 18.83 G 5.15 * 1, 58 0.08
Week 1 after treatment 61.77 16.15 71.19 18.88 T 1.79 2, 116 0.03
Week2 after treatment 63.36 16.33 75.02 21.09 G × T 0.91 2, 116 0.02

Note: N = 60. ANOVA = analysis of variance; AV = group with acne vulgaris (n = 30); CS = control group without acne vulgaris; G = group; T = treatment of hydrogen purification. Oily skin parameter is expressed in units μg/cm2; moisture in g/m2/h.* p < 0.05, ** p < 0.01; *** p < 0.001.