Table 7. Early oxygenation (PaO₂/FiO₂) in SIMV + PS success and failure.

Time	SIMV + PS success (mmHg)	SIMV + PS failure (mmHg)	P
0 h	142.4±27.3	123.0±21.6	0.169
2 h	222.6±93.0*	107.9±15.0∫	0.018
12 h	214.6±87.9**	158.2±45.0∫∫	0.243
24 h	196.7±81.9§	140.8±54.6∏	0.182
36 h	197.4±63.9†	122.4±28.6¢	0.025
48 h	205.0±85.1††	132.8±39.6£	0.132
72 h	209.3±79.1‡	133.8±26.9‖	0.086

SIMV + PS success group: 0 h vs. *, 2 h, P=0.004; **, 12 h, P=0.006; ^§, 24 h, P=0.023; ^†, 36 h, P=0.006; ^††, 48 h, P=0.013; ^‡, 72 h, P=0.005. SIMV + PS failure group: 0 h vs. ^∫, 2 h, P=0.234; ^∫∫, 12 h, P=0.164; ^∏, 24 h, P=0.517; ^¢, 36 h, P=0.970; ^£, 48 h, P=0.649; ^‖, 72 h, P=0.522. PaO₂, partial pressure of arterial oxygen; FiO₂, fraction of inspired oxygen; SIMV, synchronized intermittent mandatory ventilation; PS, pressure supportive.