Table 2. Outcomes of the patients with ARF across different grouping methods of the baseline BAR.

Exposure	Time in hospital (days)			Time in ICU (days)			In-hospital mortality			30-day mortality
	Median (IQR)	P value		Median (IQR)	P value		n (%)	P value		n (%)	P value
BAR tertile		0.001			<0.001			<0.001			<0.001
Low	9.82 (5.35–17.71)			4.30 (2.26–9.05)			360 (19.81)			259 (14.25)
Middle	10.78 (5.90–18.80)			4.64 (2.44–9.08)			529 (29.08)			356 (19.57)
High	11.45 (5.99–19.80)			4.98 (2.69–9.77)			693 (38.08)			500 (27.47)
BAR categorical		0.02			<0.001			<0.001			<0.001
≤11.76 mg/g	10.28 (5.70–18.21)			4.49 (2.31–9.07)			857 (23.99)			594 (16.63)
>11.76 mg/g	11.42 (5.92–19.77)			4.97 (2.69–9.76)			725 (38.48)			521 (27.65)

ARF, acute respiratory failure; BAR, blood urea nitrogen-to-albumin ratio; ICU, intensive care unit; IQR, interquartile range.