Skip to main content
. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Am J Kidney Dis. 2011 Feb;57(2):245–254. doi: 10.1053/j.ajkd.2010.09.027

Figure 2.

Figure 2

Time-line of questionnaire and biological sample data collection in Nurses’ Health Study for these analyses. Questionnaires are administered every two years beginning in 1976 but only questionnaire data for non-dietary covariates from years used for this study (1990 and 2000) are shown. Food frequency questionnaires (FFQ’s) asking about diet over the previous 12 months were administered in 1984, 1986, 1990, 1994, and 1998. ACR = albumin-creatinine ratio. Reproduced from inted from Lin et al^28 with permisision of the American Society of Nephrology.