Table 1

Description of the cohorts (women) at baseline

Variables	Shift work status
	Day work				Shift work without nights				Shift work with nights				All
	n	%	Mean	SD	n	%	Mean	SD	n	%	Mean	SD	n	%	Mean	SD
Age
<50 years	16 478	70.2	39.9	6.4	2772	62.3	39.6	7.0	4315	79.6	37.8	7.4	23 565	70.6	39.5	6.7
50+ years	7008	29.8	53.6	2.7	1679	27.7	53.7	2.7	1107	20.4	53.1	2.3	9794	29.4	53.5	2.6
All	23 486	100.0	44.0	8.3	4451	100.0	44.9	9.0	5422	100.0	40.9	9.1	33 359	100.0	43.6	8.6
Socioeconomic status
Upper white collar		36.8				10.7				1.8				28.9
Lower white collar		34.0				28.1				59.6				37.3
Skilled blue collar		18.3				32.8				36.7				23.3
Other blue collar		9.1				28.5				1.9				10.5
Children <6 years old
No		48.7				48.5				43.7				47.8
Yes		21.9				18.8				22.5				21.5
Missing		29.5				32.8				33.8				30.6
Children 7–8 years old
No		33.6				35.6				35.8				34.5
Yes		35.8				28.5				28.1				33.6
Missing		30.6				22.9				36.1				31.9
Smoking
No		83.6				75.9				79.3				81.9
Yes		14.1				21.1				17.7				15.6
Missing		2.3				3.0				3.0				2.5
Body mass index (kg/m²)			24.8	4.2			25.2	4.1			24.9	4.1			24.9	4.1
Alcohol consumption (g/week)			52.5	81.4			45.3	79.8			43.1	73.9			50.0	80.1