Table 2. Descriptive Statistics: Sleep Variables.

Variable	Higher scores indicate…	M (SD, N)	Range (this sample)	Range (full scale)	Interpretation of Cut-points
Chronotype	more morningness	45.48 (8.51, 434)	[24, 69]	[16, 86]	definite morning type 70–86 (0%); moderate morning type 59–69 (6%); neither 42–58 (62%); moderate evening type 31–41 (28%); definite evening type 16–30 (4%)
Sleep Hygiene	worse sleep hygiene	35.46 (6.25, 432)	[17, 53 ]	[13, 78]	N/A
Sleep Quality	worse sleep quality	5.20 (2.69, 433)	[0, 15]	[0, 21]	scores >5 indicate clinically poor sleep quality; 42% of sample
Sleepiness	more daytime sleepiness	7.49 (3.28, 435)	[0, 17]	[0, 24]	scores >10 indicate a mild to severe sleep disturbance; 18% of sample