Table 2.

Descriptive Statistics and Results of Group Comparisons for SRC vs. Control Group Sleep Metrics

	SRC (by day)			Control (2-week average)
	N	M	SD	N	M	SD	Levene's P	t test P	d
Fitbit hours asleep
Days 0-3				37	6.83	2.69	20	6.28	1.75	0.033	0.350	0.25
Days 4–7	44	5.95	1.93							0.190	0.524	0.18
Days 8–11	34	6.84	1.37							0.472	0.194	0.36
Days 12–15	31	6.60	1.62							0.617	0.497	0.19
Fitbit sleep efficiency
Days 0–3			38	91.74	7.29	20	92.56	5.47	0.569	0.660	0.13
Days 4–7	44	92.09	3.29						0.557	0.671	0.10
Days 8–11	34	92.52	2.67						0.375	0.969	0.01
Days 12–15	31	93.15	2.83						0.456	0.616	0.14
Self-reported hours asleep
Days 0–3			50	7.22	1.63	26	7.25	0.82	0.033	0.944	0.02
Days 4–7	54	7.09	1.04						0.306	0.493	0.17
Days 8–11	54	7.13	1.21						0.351	0.661	0.11
Days 12–15	48	7.03	0.95						0.303	0.341	0.24
Self-reported sleep efficiency (season 2 only)
Days 0–3				27	82.18	12.24	11	89.2	4.25	0.033	0.013	0.77
Days 4–7	29	86.85	7.13							0.150	0.314	0.40
Days 8–11	29	89.76	6.98							0.058	0.807	0.10
Days 12–15	25	89.10	7.27							0.092	0.967	0.02

Bold: p < 0.05.

M, mean; SD, standard deviation; SRC, sport-related concussion.