“…Oxygenation outcomes were analyzed based on the mean pre-PP Pa o 2 /F io 2 less than or equal to 150 (13 studies [ 11 , 30 , 31 , 35 , 39 , 43 , 45 , 49 ]) or greater than 150 (9 studies [ 2 , 10 , 29 , 32 , 34 , 37 , 41 , 47 , 49 ]). Patients with a Pre-PP Pa o 2 /F io 2 greater than 150 had higher improvement in oxygenation (Pa o 2 /F io 2 ) post PP when compared with those with a pre-PP Pa o 2 /F io 2 less than or equal to 150 (MD = 41.3 [95% CI, 13.9–68.6; p = 0.001] vs MD = 38.6 [95% CI, 20.8–56.4; p = 0.001) ( Fig.…”