Table 4.

Distribution (%) of working hour characteristics summarized by individuals in the three countries

		DWHD (Denmark)	WHFPS (Finland)	RWHS (Norway)
Dayshift	0	2	1	2
	1–100	45	41	58
	101–200	41	45	36
	> 200	13	13	4
Eveningshift	0	32	42	16
	1–12	17	22	13
	13–50	30	24	34
	> 50	21	12	37
Nightshift	0	52	54	33
	1–12	20	13	20
	13–50	18	23	33
	> 50	10	10	14
Early morning shift	0	94	99	98
	1–12	6	1	2
	13–50	0	0	0
	> 50	0	0	0
Long shift (≥ 9 h < 12 h)	0	22	34	20
	1–12	42	33	28
	13–50	29	25	37
	> 50	7	8	15
Very long shift (≥ 12 h < 24 h)	0	55	56	69
	1–12	33	36	28
	13–50	11	7	2
	> 50	1	1	1
Quick returns (<  11 h between shifts)	0	37	24	17
	1–12	47	29	19
	13–50	15	42	58
	> 50	1	5	6
Long weeks (> 40 h/week)	0	38	61	23
	1–12	56	33	70
	13–50	6	6	7
	> 50	0	0	0
Very long weeks (> 48 h/week)	0	79	80	59
	1–12	21	20	41
	13–50	1	0	0
	> 50	0	0	0
Periods of ≥ 5 consecutive night shifts	0	93	85	94
	1–12	5	12	6
	> 12	2	3	0

DWHD The Danish Working Hour Database (Denmark), WHFPS The Working Hours in the Public Sector (Finland), RWHS the Register study of Working hour, Health and Sickness absence (Norway)