Table 4:

Percentage of Shifts in a Year by each Working Hour Characteristic Stratified by Person-year Shift Schedules in the American Manufacturing Cohort (AMC) 51 plant cohort 2003-2014, USA (N= 98,771 person-years)

		Working Hour Characteristic
		Shift Type				Intensity			Duration							Rotation Pattern					Social Aspects
		Morning	Day	Evening	Night	Non-quick return	Quick return	Very quick return	Shift			Week				No Rotation	Rotation	Forward Rotation	Backward Rotation	Flipped Rotation	Weekday	Weekend
									<12 hours	≥12 hours	≥13 hours	<40 hours	≥40 hours	≥48 hours	≥60 hours
Person-year Shift Schedule	Permanent Day	11.2	87.4	0.7	0.7	98.6	1.4	0.4	80.8	19.2	1.5	90.9	9.1	4.7	1.1	99.2	0.8	0.4	0.4	0.1	87.7	12.3
	Permanent Evening	0.04	2.5	95.7	1.5	96.6	3.4	1.5	93.9	6.1	3.3	90.8	9.2	3.9	0.9	94.7	5.3	2.7	2.7	0.02	86.0	14.0
	Permanent Night	0.2	1.0	0.9	98.0	96	4.0	1.5	70.2	29.8	4.3	89.0	11.1	7.1	2.4	96.0	4.0	1.8	1.9	0.2	76.4	23.6
	Day/Evening	2.7	51.7	44.0	1.6	89.7	10.4	3.7	85.0	15.0	9.2	90.2	9.9	5.7	1.9	93.3	6.7	3.2	3.3	0.2	86.1	13.9
	Day/Night	6.0	48.5	1.4	44.1	95.5	4.6	1.4	39.6	60.4	6.4	88.5	11.5	7.2	2.7	83.1	16.9	1.8	1.8	13.4	77.4	22.6
	Evening/Night	1.5	2.3	55.9	41.8	93.0	7.0	2.4	77.3	22.7	6.9	89.6	10.4	6.0	2.0	92.2	7.8	3.7	3.8	0.3	81.4	18.6
	Day/Evening/Night	1.2	36.1	30.7	31.8	88.3	11.7	4.1	74.4	25.6	11.8	89.4	10.6	6.6	2.6	81.0	19.0	10.4	6.0	2.6	78.1	22.0

Most shift domain categories are not mutually exclusive and marginal totals of shift domains will not sum to 100%.

Within each cell, columns are the numerator, rows are the denominator. Therefore, the number in the first row and first column states 11.2% of permanent day worker’s shifts are morning shifts. Refer to Appendix Table 1 for specific definitions for each working time characteristic.