Table 2. Correlations between long-term and short-term shiftwork.

		Long-term					5-Day				14-Day
		Daytime	Afternoon shifts	Night shifts	Total hours	Shift changes	Daytime	Afternoon shifts	Night shifts	Daytime	Afternoon shifts
Long-term	Afternoon	−0.60	—	—	—	—	—	—	—	—	—
	shifts	(<0.01)
	Night shifts	−0.47	0.10	—	—	—	—	—	—	—	—
		(<0.01)	(0.44)
	Total hours	0.13	0.17	−0.01	—	—	—	—	—	—	—
		(0.32)	(0.18)	(0.96)
	Shift changes	−0.17	0.64	0.05	0.10	—	—	—	—	—	—
		(0.17)	(<.01)	(0.70)	(.042)
5-Day	Daytime	0.34	−0.26	<−0.01	0.09	−0.17	—	—	—	—	—
		(<.01)	(0.03)	(0.99)	(0.50)	(0.17)
	Afternoon	−0.49	0.63	0.12	0.11	0.26	−0.25	—	—	—	—
	shifts	(<0.01)	(<0.01)	(0.34)	(0.38)	(0.03)	(0.04)
	Night shifts	−0.13	−0.22	0.39	<0.01	−0.07	−0.23	−0.04	—	—	—
		(0.31)	(0.08)	(<0.01)	(0.98)	(0.55)	(0.06)	(0.73)
14-Day	Daytime	0.29	−0.17	0.03	0.11	−0.18	0.90	−0.12	−0.26	—	—
		(0.02)	(0.17)	(0.84)	(0.37)	(0.16)	(<0.01)	(0.34)	(0.03)
	Afternoon	−0.55	0.52	0.19	0.10	0.17	−0.22	0.88	0.05	−0.14	—
	shifts	(<0.01)	(<0.01)	(0.13)	(0.44)	(0.18)	(0.08)	(<0.01)	(0.71)	(0.27)
	Night shifts	−0.12	−0.24	0.39	−0.07	−0.05	−0.20	−0.04	0.85	−0.27	0.07
		(0.36)	(0.06)	(<0.01)	(0.57)	(0.73)	(0.10)	(0.73)	(<0.01)	(0.03)	(0.57)

Spearman correlation coefficients (p values) for relationships among cumulative long-term and short-term (5- and 14-day) shiftwork measures.