Table 7.

Correlation between age and TG, WL, shifts per week, PSQI, and ESS total score using Spearman’s correlation coefficient (n = 117)

	Age		TG		WL		Shifts per week		PSQI		ESS
	r	p	r	p	r	p	r	p	r	p	r	p
Age	1.00	0.00	0.72*	0.00	0.15	0.26	0.13	0.15	0.97	0.30	-0.03	0.97
TG	0.72	0.00*	1.00	0.00	0.98	0.00	0.11	0.23	0.27	0.77	0.09	0.92
WL	0.10	0.26	0.98	0.00*	1.00	0.00	0.02	0.01	-0.02	0.83	-0.01	0.85
Shifts per week	0.13	0.15	0.11	0.23	0.90	0.00*	1.00	0.00	0.01	0.908	-0.04	0.66
PSQI	0.20	0.82	0.15	0.87	0.89	0.38	0.12	0.18	0.86	0.29	0.30	0.01*
ESS	0.12	0.19	0.09	0.29	0.15	0.86	-0.40	0.61	0.33	0.00*	1.00	0.00

WL = workload; ESS = Epworth Sleepiness Scale; PSQI = Pittsburgh Sleep Quality Index; TG = time since graduation.

^*p < 0.05.