Table 3 The predefined oxygen exposures during study period between the two oxygen regimens among the included studies

Schjørring et al., 2021 [19]

93 (92–94) vs. 96 (95–97), P <0.05

71 (67–77) vs. 93 (87–99), P <0.05

43 (34–54) vs. 56 (46–71), P <0.05

Barrot et al., 2020 [11]

−3.8 (95% CI, −4.3 to −3.2)

−28.1 (95% CI, −38.4 to −17.7)

NR

−15.5 (95% CI, −19.1 to −12.0)

Yang et al., 2018 [13]

95.7±2.3 vs. 98.2±1.8, P<0.001

84 (71–99) vs. 98 (79–116), P=0.060

NR

33 (25–42) vs. 42 (36–50)

Girardis et al., 2016 [8]

NR

87 (79–97) vs. 102 (88–116), P<0.001

50±97 vs. 21±102, P=0.15

0.36 (0.30–0.40) vs. 0.39 (0.35–0.42), P<0.001

Panwar et al., 2015 [18]

93.4 (92.9–93.9) vs.97 (96.5–97.5), P <0.001

70 (68–73) vs. 92 (89–96), P <0.001

NR

0.26 (0.25-0.28) vs. 0.36 (0.34-0.39), P<0.001

Asfar et al., 2017 [2]

NR

P<0.0001

P=0.0039

NR

Mackle et al., 2019 [12]