Table 2.

Prespecified adverse events during the study period.

	H2 group, N (%)	Control group, N (%)	P value
Total	37 (95)	28 (88)	0.40
18 h	10 (26)	9 (28)	1.00
24 h	23 (59)	21 (66)	0.63
48 h	31 (82)	24 (75)	0.57
72 h	29 (78)	22 (69)	0.42
14 days	16 (47)	16 (57)	0.46
30 days	8 (24)	7 (35)	0.53
90 days	2 (6)	5 (25)	0.10

Hours and days indicate the time from the start of the trial gas inhalation. Fisher exact test.

Abbreviation: H₂, molecular hydrogen.