Table 5.

ESS Internal Consistency Data

ESS Items (α = .70)	Item-total correlation*
Sitting/reading	.45
Watching TV	.38
Public place	.45
Car passenger	.40
Afternoon	.34
Sit/talking	.35
After lunch	.51
In traffic	.30

Note: N = 3,055. ESS = Epworth Sleepiness Scale.

^*Pearson correlation with total score, corrected for overlap; all p values < .001.