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Correlation between HF + LF values and clinical severity score in patients in pediatric intensive care unit. PELOD scores: Pediatric Logistic Organ Dysfunction scores; HF + LF: high and low frequency power of heart rate variability. The Spearman rank correlation coefficient ρ = −0.77, 95% CI: −0.91, −0.47; P < 0.001. In the figure, HRV data (x-axis) have been logarithmically transformed (i.e., HRV data).
