Table 1.

Baseline characteristics in the total study population

	Total study population (n = 260,151)	Screening-recruited cohorts (n = 24,727)	Other centers (n = 235,424)
WCRF/AICR lifestyle score, mean (SD)	4.5 (1.1)	4.5 (1.1)	4.5 (1.1)
Age at recruitment, mean (SD)	51.7 (9.9)	55.5 (7.2)	51.3 (10.0)
Highest level of attained education, %
None/primary school	30.4	31.1	30.3
Technical/secondary school	41.7	52.1	40.6
University degree	23.7	16.6	24.4
Unknown/missing	4.2	0.2	4.7
Smoking status, %
Never smokers	59.1	45.1	60.6
Former smokers	21.8	30.6	20.9
Current smokers	17.5	24.3	16.8
Unknown/missing	1.5	0.0	1.7
Chronic diseases at recruitment, %
Yes	3.3	4.5	3.2
Unknown	6.8	0.4	7.5
Menopausal status, %
Premenopausal	33.4	17.6	35.0
Postmenopausal	49.9	65.0	48.3
Perimenopausal	16.8	17.5	16.7
Ever use of oral contraceptive pills, %
Yes	56.7	57.7	56.6
Unknown	0.4	0.1	0.4
Ever use of menopausal hormone therapy, %
Yes	24.7	23.6	24.8
Unknown	6.0	0.1	6.6
Age at menarche, %
< 12 years	15.7	15.6	15.7
≥ 12 to ≤ 15 years	77.1	75.9	77.2
> 15 years	6.2	7.2	6.1
Unknown	1.0	1.3	1.0
Age at first full-term pregnancy, %
Nulliparous	15.6	13.9	15.8
< 21 years	11.7	6.3	12.3
≥ 21 to ≤ 30 years	63.9	69.1	63.4
> 30 years	8.6	10.7	8.4
Unknown	0.2	0.0	0.2

SD standard deviation, WCRF/AICR World Cancer Research Fund/American Institute for Cancer Research