TABLE 3.

Means (SD) of retrospective outcome measures at Period 1 and Period 2 with calculated effect sizes and t‐statistics.

Measure	Period 1, mean (SD)	Period 2, mean (SD)	Cohen's d	t(df), p value
ISI*	8.41 (4.05)	6.96 (4.19)	0.50	t(26) = 2.60, p = 0.015
FSS	3.57 (0.79)	3.52 (1.04)	0.05	t(27) = 0.28, p = 0.78
CSM	32.50 (6.81)	32.46 (6.81)	0.01	t(25) = 0.07, p = 0.95
CASQ	30.05 (5.24)	37.82 (6.15)	0.04	t(21) = 0.20, p = 0.84
STICSA Cognitive	16.79 (4.46)	16.07 (5.29)	0.32	t(27) = −1.21, p = 0.10
STICSA Somatic	16.07 (3.73)	15.11 (2.92)	0.18	t(27) = 0.95, p = 0.35
CESD‐R	7.96 (6.44)	8.21 (6.90)	−0.06	t(23) = −0.27, p < 0.79
SF36	73.27 (16.91)	74.42 (16.57)	−0.08	t(25) = −0.41, p < 0.69

Abbreviations: CASQ, Cleveland Adolescent Sleepiness Questionnaire; CESD‐R, The Center for Epidemiologic Studies Depression Scale–Revised; CSM, 13‐Item Composite Scale of Morningness; FSS, Fatigue Severity Scale; ISI, Insomnia Severity Index; SF36, 36‐Item Short Form Survey Instrument; STICSA, State – Trait Inventory of Cognitive and Somatic Anxiety.

^* p < 0.05.