Figure 3
From: Functional maturation in preterm infants measured by serial recording of cortical activity
EEG maturational age (EMA) measurement in preterm infants. (A) The flow diagram of the EMA algorithm. Percentages in brackets after features refer to the percentile estimated by the feature, for example, envelope (50%) is the 50th percentile or median envelope calculated in the period of interest. SAT is spontaneous activity transient, rEEG is the range EEG, and RMS is the root-mean-square. In this case, delta was 0–3 Hz, theta was 3–8 Hz, alpha was 8–15 Hz and beta was 15–30 Hz. (B) The EEG dataset used in this study. The figure shows the distribution of post-menstrual age (PMA) of EEG recordings. The table shows additional demographics of the EEG cohort used in this study - data are summarised as median (interquartile range), except gender which is given as a count. Cohort sample size was 43 infants, 152 EEG recordings and 1080, one hour EEG epochs. (C) Evaluating the EMA within a leave-one-subject cross-validation. The dataset was iteratively split into training and test sets and the efficacy of the EMA was assessed by comparing the EMA from the test set to the PMA of EEG recording. The diagonal lines denote errors of plus and minus 0, 1 and 2 weeks.
