During the pre test phase 69 were completed and 44 during the post-test period. Comparisons between the participants in the pre test and post-test were made. Comparisons of the level of fatigue experienced at post-testing were made using an analysis of variance technique. The means and standard deviations of the scores on each of the instruments is presented in Table 1. These results indicate that there is a significant difference between several of the variables.
Results indicate increase levels of alertness and reduced levels of fatigue.
In addition, respondents were less likely to describe themselves with adjectives relating to sleep and more likely to report receiving more hours of sleep. In order to prevent confounding of the results however, it was decided that the pre test data was comprised of subjects coming on and off duty, while the posttest survey data was only from persons going on duty. In order to reduce confounding these subjects were removed from the analysis so that only comparisons between employees coming on duty both pre and post were made. Again, no differences were seen in naps over the last three trips. Employees participating in the Time Windows Project were either Engineers or Conductors in the Pasco Pool.