Acute kidney injury is a powerful independent predictor of mortality in critically ill patients: a multicenter prospective cohort study from Kinshasa, the Democratic Republic of Congo

Table 3 Risk factors and all-cause mortality in critically ill patients

Characteristics	n	PD	Deaths	Mortality rate	Hazard ratio
Characteristics	n	PD	Deaths	(per 1000 PD) ^b	Crude (95%CI)	p	Adjusted ^a (95%CI)	p
AKI
- no AKI	225	1420	62	43.7	1		1
- AKI	251	1451	146	100.6	2.30 (1.71–3.10)	<0.001	1.82 (1.34–2.48)	<0.001
Systems affected
- <2	202	1066	47	44.1	1		1
- ≥2	274	1805	161	89.2	2.32 (1.68–3.22)	<0.001	1.63 (1.15–2.30)	0.006
Peripheral oxygene saturation
- ≥90	364	2195	131	59.7	1		1
- <90 %	112	676	77	113.9	2.22 (1.67–2.95)	<0.001	1.53 (1.13–2.08)	0.006
Polypnea
- <24 cycles/min	158	863	34	39.4	1		1
- ≥24 cycles/min	318	2008	174	86.7	2.43 (1.68–3.51)	<0.001	1.60 (1.08–2.37)	0.018
Overall	476	2871	208	72.4

Patients contributed a total of 2871 days of follow-up. Overall the mortality rate was 72.4 (95%CI: 62.6–82.3) patients per 1000 patient-days
^aFour variables listed in the table were introduced in the Cox model
^bPD: patient-days

ISSN: 1471-2369