Table 1 Number of men and women, by work schedule, in a representative sample of Danish employees in 1990.

Work schedule	Men	Women
Permanent day duty	2371	2208
Two shifts	84	64
Three shifts	71	43
Fluctuating according to special schedule or rotation	227	168
Permanent evening duty	34	96
Permanent night duty	46	50
Permanent morning duty	8	23
Other non‐day work	12	12
All workers	2853	2664

Of the total 5455 workers, 3657 had at least a seniority of 3 years.