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. Author manuscript; available in PMC: 2012 Jun 19.
Published in final edited form as: Eur J Clin Nutr. 2011 Nov 30;66(5):561–568. doi: 10.1038/ejcn.2011.197

Table 1.

Characteristics of the 5 cohorts participating in analyses of vitamin C and breast cancer risk in the UK Dietary Cohort Consortium

Cohort Participants Diary
days		 Years when
food diary
completed		 Last
follow up
date		 Mean
time to
diagnosis
of cases		 Cases Controls Mean(sd)
dietary
vit c
intake		 Mean(sd)
total
vit c
intake
EPIC-Norfolk General population in
Norfolk		 7 days 1993-1998 31.12.2006 6.0 yrs 365 1329 91 (50) 118 (167)
EPIC-Oxford General population and
vegetarians in the UK		 7 days 1993-1998 31.12.2004 3.5 yrs 194 194 111 (61) 233 (436)
UK Women’s
Cohort Study
(UKWCS)		 Middle aged women in
the UK		 4 days 1999-2003 31.12.2006 2.4 yrs 42 202 118 (60) 251 (376)
Whitehall II Civil servants in the UK 7 days 1991-1993 30.09.2005 7.8 yrs 70 275 101 (51) _a
National
Survey of
Health and
Development
(NSHD)		 Nationally reprehensive
cohort of women who
were born in one week
in March 1946 in
England, Wales and
Scotland.		 5 days 1989 31.12.2006 10.8 yrs 36 144 66 (37) _a
a

Whitehall and NSHD did not have detailed diary data of vitamin C intake from supplements