Nutrient-wide association study of 92 foods and nutrients and breast cancer risk

Breast Cancer Research

Table 1 Distribution of baseline demographic characteristics and covariates in the EPIC study

		Total		Non-case		Case
		n	%	n	%	n	%
	Total	272,098	100	261,119	100	10,979	100
Age at recruitment (years)	[19.9, 40)	33,452	12	32,896	13	556	5
	[40, 45)	35,784	13	34,720	13	1064	10
	[45, 50)	52,234	19	50,102	19	2132	19
	[50, 55)	60,487	22	57,499	22	2988	27
	[55, 60)	42,506	16	40,278	15	2228	20
	[60, 65)	33,176	12	31,668	12	1508	14
	[65, 70)	10,996	4	10,580	4	416	4
	[70, 75)	2966	4	2886	1	80	1
	[75, 98.5]	497	0	490	0	7	0
Smoking status	Never	158,234	58	152,103	58	6131	56
	Former	60,085	22	57,419	22	2666	24
	Current	53,779	20	51,597	20	2182	20
Education	None/primary school	82,923	30	79,947	31	2976	27
	Technical/professional school	57,553	21	55,074	21	2479	23
	Secondary school	66,456	24	63,663	24	2793	25
	Longer education (incl. university degree)	65,166	24	62,435	24	2731	25
BMI (kg/m²)	[10.2, 20)	22,799	8	22,007	8	792	7
	[20, 23)	79,289	29	76,013	29	3276	30
	[23, 25)	55,581	20	53,238	20	2343	21
	[25, 30)	78,670	29	75,440	29	3230	29
	[30, 35)	26,452	10	25,443	10	1009	9
	[35, 77.9]	9307	3	8978	3	329	3
Physical activity	Inactive	60,140	22	57,932	22	2208	20
	Moderately inactive	94,409	35	90,456	35	3953	36
	Moderately active	75,196	28	72,163	28	3033	28
	Active	42,353	16	40,568	16	1785	16
Diabetes	No	265,318	98	254,607	98	10,711	98
Diabetes	Yes	6780	2	6512	2	268	2
Postmenopausal	No	146,620	54	141,379	54	5241	48
Postmenopausal	Yes	125,478	46	119,740	46	5738	52
Parous	No	42,130	15	40,579	16	1551	14
Parous	Yes	229,968	85	220,540	84	9428	86

ISSN: 1465-542X