Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Changes in sleepiness ratings: (a) distribution of KSS scores pre-; (b) posttask; and (c) box plot displaying median KSS scores centrally in the box. Top and bottom values of the box represent the upper and lower interquartile range (H-spread) containing 50% of cases. The whiskers represent the highest and lowest scores which lie within 1.5 times the H-spread. Values >1.5 times the H-spread are outliers, represented by circles.
