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Table 2 Exploratory endpoints (change from baseline after treatment) in FAS and PPS population

From: Hydrogen/oxygen therapy for the treatment of an acute exacerbation of chronic obstructive pulmonary disease: results of a multicenter, randomized, double-blind, parallel-group controlled trial

Exploratory endpoints

Mean change from baseline (95% CI) in FAS population

Mean change from baseline (95% CI) in PPS population

Oxygen group

Hydrogen/oxygen group

P value

Oxygen group

Hydrogen/oxygen group

P value

Pulmonary function

 FVC

0.18 (0.07, 0.29)

0.10 (− 0.01,0.21)

0.309

0.19 (0.08, 0.31)

0.10 (− 0.01, 0.21)

0.250

 FEV1

0.12 (0.06, 0.19)

0.11 (0.04, 0.18)

0.769

0.13 (0.06, 0.19)

0.11 (0.03, 0.18)

0.698

 FEV1/FVC (%)

1.52 (− 0.40, 3.44)

2.45 (− 0.10, 4.99)

0.563

1.22 (− 0.83, 3.29)

2.29 (− 0.39, 4.97)

0.529

Arterial blood gas

 pH

0.001 (− 0.013, 0.014)

0.004 (− 0.009, 0.018)

0.700

0.001 (− 0.013, 0.016)

0.003 (− 0.010, 0.017)

0.875

 PaO2 (mmHg)

− 0.45 (− 5.65, 4.75)

3.46 (− 5.77, 12.70)

0.461

1.39 (− 3.87, 6.65)

4.46 (− 5.74, 14.66)

0.592

 PaCO2 (mmHg)

0.71 (− 1.09, 2.51)

− 1.09 (− 2.88, 0.71)

0.160

0.53 (− 1.42, 2.48)

-0.55 (− 2.44, 1.34)

0.424

 HCO3− (mmol/L)

0.61 (− 0.39, 1.62)

− 0.36 (− 1.20, 0.48)

0.136

0.56 (− 0.49, 1.61)

− 0.14 (− 1.03, 0.76)

0.315

  1. FVC forced vital capacity, FEV1 forced expiratory volume in 1 s, PaO2 arterial oxygen pressure, PaCO2 arterial carbon dioxide pressure, HCO3− bicarbonate, 95% CI 95% confidence interval, FAS full analysis set, PPS per-protocol set