Table 4

Retrospectively rated alertness as a function of time on shift; analysis of covariance, examining direction of rotation and continuity

df F
Effects between groups:
 Direction1,3601.24
 Continuity1,3600.24
 Direction×continuity1,3600.89
Effects within groups:
 Shift2,7204.524-150
 Shift×direction2,7201.91
 Shift×continuity2,7200.16
 Shift×direction×continuity2,7201.27
 Time on shift3,10802.41
 Time on shift×direction3,10800.65
 Time on shift×continuity3,10800.74
 Time on shift×direction×continuity3,10802.874-150
 Shift×time on shift6,21603.784-160
 Shift×time on shift×direction6,21600.25
 Shift×time on shift×continuity6,21600.46
 Shift×time on shift×direction×continuity6,21600.12

  • ↵4-150 p<0.05;

  • ↵4-160 p<0.01.