Associations between circadian, sleep, and mood disturbances in Uruguayan dance students

Table 1 Demographic, chronobiological, and sleep characteristics between shifts

	Total	Morning-shift	Night-shift	p-value	Cohen's w/d
n	26	9	17
Gender (F/M)	21/5	7/2	14/3	1.00 ns	0.06
Age (years)	22.27 ± 2.43 (min: 18, max: 28)	22.78 ± 2.17	22.00 ± 2.57	0.45 ns	0.32
MSFsc (MCTQ)^a	05:43 ± 01:35 (min: 02:11, max: 07:47)	05:10 ± 01:36	06:00 ± 01:33	0.21 ns	0.53
SJL (MCTQ)^b	1.58 ± 1.45 (min: -1.26, max: 3.75)	2.12 ± 1.24	1.30 ± 1.51	0.18 ns	0.57
AvSD (MCTQ)^c	7.10 ± 1.31 (min: 4.55, max: 10.36)	7.12 ± 0.70	7.09 ± 1.56	0.96 ns	0.02

Values are reported as mean ± SD. Fisher’s exact test for discrete variables and Independent-samples t-test for continuous variables. Effect sizes were calculated as Cohen's w for frequency differences and Cohen's d for differences in means between groups. ^aMSFsc: midpoint of sleep on free days corrected (presented in military format); ^bSJL: the absolute difference between the midpoints of sleep on work and free days; ^cAvSD: average sleep duration estimated from sleep onset and end on work and free days. MSFsc and SJL correlated as expected (Pearson’s correlation r=0.52, p=0.006); the later the chronotype, the higher the SJL

ISSN: 2398-2683