submission - Independent Pilots Association

and alcohol intoxication conditions were then collapsed into two-hour bins and 0.027c BAC
intervals. respectively.
Evaluation of systematic changes in each performance parameter across time (hours of
wakefulness) or blood alcohol concentration were assessed separately by repeated-rneasures
analysis of variance (ANOVA). with significance levels corrected for sphericity by Greenhouse-
Geisser epsilon.
Linear regression analysis was used to determine the relationship between test performance,
hours of wakefulness and alcohol intoxication. The relationship between neurobehavioural
performance and both hours of wakefulness and BAC a¡e expressed as a percentage drop in
performance for each hour of wakefulness or each percenta-qe increase in BAC, respectively. For
each perforrnance parameter. the percentage drop in test performance in each of the two
conditions was also equated. and the effects of sustained waliefulness on performance expressed
as a BAC equivalent.