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Detrended fluctuation analysis of ISP signal. (A) Example of raw (white, top) and integrated detrended (yellow, bottom) ISP signal. (B) Log F(n) vs. Log n plot and trend-line (R = 1.00, slope = α). (C) Raw (white, left) and integrated detrended (yellow, right) ISP signals with increasing α. (D) ISP vs. α (green). Trend-line R = −0.18. (E) SCPP vs. α (blue). Trend-line R = 0.19. (F) sPRx vs. α (black). Trend-line R = −0.98. For (C–E) n = 49 patients, mean±standard error.
