Algorithm 1 Percentage of missing data for each HRV window

1:for each RR[i] in the window (i from 1 to length of HRV window) do 2:    Compute         $gap=T\left[i\right]-T[i-1]$ 3:    if $gap>$ 1.3 s then 4:        Compute mean RR over last 10 values ($mea{n}_{RR}$) 5:        Compute N, the number of missing RR in the gap:         $N=\mathrm{Floor}\mathrm{value}(\frac{gap}{R{R}_{mean}}$) 6:    end if 7:    Compute $N_{tot}$, the total number of missing RR in the window $N_{tot}=\sum N$ 8:    Compute percentage of missing data: $P_{missing}=100\ast \frac{N_{tot}}{\mathrm{Length}\mathrm{of}\mathrm{window}+N_{tot}}$ 9:end for  $RR\left[i\right]$ is the RR value at position i, and $T\left[i\right]$ its timestamp