Claudia Maldonado|Alison Bentley|Duncan Mitchell
A Pictorial Sleepiness Scale Based on Cartoon Faces
University of the Witwatersrand|University of the Witwatersrand|University of the Witwatersrand
designsubjects asked rank order 7 cartoon faces representing degrees sleepiness used thurstones scaling procedure transform rankings interval scale allowed us eliminate 2 faces remaining 5 faces ranked using subjects validation study subjects rated perceived level sleepiness using scale sleepiness scales employed shiftworkers schoolgoing children used scale assess practical applicability