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Detrended Fluctuation Analysis (DFA). Black dots represent healthy patients and empty squares ICU cases. Dashed and continuous lines reflect predicted values (adjusted for comorbidities) for the respective group along with 95% confidential intervals (curved lines). x-axis represents years. It is to be noted that DFA index was significantly different between the two groups even when adjusted for other comorbidities and age (P = 0.02). Age affects DFA index in both groups.
