Identification of focal ARDS using PF ratio: a cross-sectional study

Table 1 Predictors of focal ARDS

	N	Focal ARDS	OR (95% CI)	P value
All patients	152	16 (10.3%)	NA	NA
ARDS severity^a
Mild	39	4 (10.3%)^b,c	Reference	Reference
Moderate	62	4 (6.5%)^b,c	0.60 (0.14–2.57)	0.494
Severe	51	8 (15.7%)^b,c	1.62 (0.45–5.86)	0.456
PF ratio < 150 mmHg	86	10 (11.6%)	1.32 (0.45–3.83)	0.614
PF ratio (mmHg)	152	16 (10.3%)	1.00 (0.99–1.01)	0.691

^aMild ARDS: PF ratio 201–300 mmHg and PEEP ≥ 5 cmH₂O. Moderate ARDS: PF ratio 101–200 mmHg and PEEP ≥ 5 cmH₂O. Severe ARDS: PF ratio ≤ 100 mmHg and PEEP ≥ 5 cmH₂O
^bFisher exact test, P = 0.275
^cChi-square test for trend, P = 0.345
ARDS acute respiratory distress syndrome, CI confidence interval, NA not applicable, OR odds ratio, PEEP positive end-expiratory pressure, PF ratio partial pressure of oxygen in arterial blood divided by the inspired oxygen fraction

ISSN: 1364-8535