Abstract
This study was undertaken to quantitate the 24 hr. variability in the distribution of states for 5 healthy preterm infants. 12 studies were conducted in which state was coded by independent EEG & behavioral scores for each minute under standard nursing conditions over a continuous 24 hr. period excluding feeding times (x̄ study time = 1225 mins). We calculated the percent time Quiet Sleep (%QS), Active Sleep (%AS), Indeterminate Sleep (%IS), and Wakefulness (%W) for 3 post-conceptional age groups:
These data demonstrate increased W and better organization of sleep with maturation. State distribution was also calculated for each interfeed epoch (n=8) to obtain standard deviations (SD) for %QS, %AS, %IS & %W in each study. The average SD (x̄SD) for each state was used to determine the variability in estimates of 24 hr. state distribution when less than 8 epochs are observed:
X̄SD for %QS when only 1 interfeed epoch is used is 6.45; when 8 epochs are used X̄SD=2.28. The results demonstrate the importance of long term measurements of state distribution. Short term observations may be misleading.
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Stefanski, M., Schulze, K., Masterson, J. et al. VARIABILITY IN 24 HOUR STATE DISTRIBUTION IN PRETERM INFANTS. Pediatr Res 18 (Suppl 4), 114 (1984). https://doi.org/10.1203/00006450-198404001-00129
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DOI: https://doi.org/10.1203/00006450-198404001-00129
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