Table 2

Individual difference and biographical information, as functions of direction of rotation and continuity (adjusted means)

	Continuous			Discontinuous	df			F_Continuity		F_Interaction
	Delaying											Advancing		Delaying		Advancing
	mean	SEM										mean	SEM	mean	SEM	mean	SEM
Age (y)	41.69	0.88	40.99	0.85	40.36	1.30	37.90	0.73	1,523	2.69	5.24^2-150	0.823
Number of dependants	1.12	0.10	1.32	0.10	1.13	0.15	1.21	0.08	1,508	1.55	0.19	0.35
Shiftwork experience (y)	18.56	0.89	17.17	0.86	15.84	1.29	11.83	0.74	1,528	7.80^2-160	17.41^2-165	1.83
Work experience (y)	25.57	0.94	24.73	0.90	24.00	1.41	20.66	0.78	1,521	4.05^2-150	7.41^2-160	1.46
Present rota experience (y)	13.22	0.72	9.79	0.69	9.98	1.04	7.39	0.59	1,527	15.04^2-165	13.20^2-165	0.29
Actual work hours	45.29	0.61	44.89	0.58	45.80	0.86	42.19	0.50	1,515	9.40^2-160	2.82	6.05^2-150
Contracted work hours	38.47	0.28	40.32	0.26	40.56	0.40	38.12	0.22	1,525	0.96	0.04	52.06^2-165
Average commuting time (mins)	19.52	1.50	19.82	1.44	24.00	2.17	19.26	1.23	1,531	1.87	1.45	2.40
Perceived workload:
Morning	3.69	0.07	3.58	0.06	3.68	0.10	3.47	0.06	1,522	4.66^2-150	0.79	0.43
Afternoon	3.43	0.06	3.47	0.06	3.53	0.10	3.33	0.05	1,521	1.47	0.06	3.32
Night	3.07	0.07	3.33	0.06	3.45	0.10	3.18	0.06	1,518	0.02	2.51	13.24^2-165
Work pace	2.83	0.11	2.73	0.10	2.98	0.16	2.92	0.09	1,521	0.48	2.08	0.03
Flexibility	4.95	0.25	4.97	0.24	4.56	0.36	5.16	0.21	1,531	1.35	0.14	1.14
Morningness	4.50	0.22	4.36	0.21	5.25	0.31	4.78	0.18	1,528	1.70	6.26^2-150	0.52
Perceived sleep need (h)	7.42	0.10	7.43	0.10	7.28	0.15	7.18	0.08	1,526	0.19	3.22	0.26
Shift changeover time (night to morning)	06:37	2 min	05:55	2 min	05:59	3 min	06:00	2 min	1,524	70.56^2-165	43.40^2-165	76.09^2-165