Table 7.

Interaction between percentage of total body surface area burned and RIFLE stage

VariableRIFLE StageSlope (d/percentage TBSA) (95% CI)P Value
Mechanical ventilation daysNo AKI
Risk
Injury
Failure0.15 (0.06–0.24)
0.37 (0.22–0.53)
0.42 (0.24–0.61)
0.51 (0.31–0.72)—
0.004
0.004
<0.001
ICU daysNo AKI
Risk
Injury
Failure0.49 (0.32–0.66)
0.88 (0.61–1.15)
0.57 (0.24–0.90)
1.36 (1.00–1.72)—
0.005
0.65
<0.001
Hospital daysNo AKI
Risk
Injury
Failure1.15 (0.89–1.41)
1.26 (0.85–1.68)
0.56 (0.05–1.07)
1.46 (0.90–2.01)—
0.60
0.02
0.28
  • Slope and 95% confidence of the analysis of covariance model comparing the outcome (in days) versus RIFLE stage with percentage TBSA as the covariate. P values reflect the comparison between the specified RIFLE stage versus no AKI. RIFLE, Risk-Injury-Failure-Loss-End Stage; TBSA, total body surface area burned; CI, confidence interval; ICU, intensive care unit.