Table 2. Crude and adjusted odds ratios for hospital mortality between groups^*.

	OR (95% CI)	p-value
Crude analysis	0.50 (0.33–0.78)	0.002
Model 1 †	0.47 (0.30–0.74)	0.001
Model 2 ‡	0.45 (0.29–0.72)	0.001
Model 3 §	0.70 (0.41–1.20)	0.196
Model 4 ||	0.81 (0.46–1.41)	0.452

* Invasive mechanical ventilation is the referent group.

^† Model 1: adjusting for age and sex.

^‡ Model 2: adjusting for model 1 + antecedent characteristics (body mass index + comorbidities + functional status).

^§ Model 3: adjusting for model 2 + non-respiratory SOFA + source.

^|| Model 4: adjusting for model 3 + ABG variables (P_aO₂/FiO₂ ratio, pH, Pco₂).