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World J Gastroenterol. Feb 7, 2011; 17(5): 651-656
Published online Feb 7, 2011. doi: 10.3748/wjg.v17.i5.651
Published online Feb 7, 2011. doi: 10.3748/wjg.v17.i5.651
Figure 1 Definition of hazard and control periods in this case-crossover study.
Hazard period was defined as the 2- or 4-wk window before the index date. A 4-wk washout period was chosen between the end of the hazard period and the start of the control period. Two consecutive control periods were defined as 2- or 4-wk windows.
- Citation: Choi NK, Chang Y, Jung SY, Choi YK, Lee J, Lee JH, Kim JY, Park BJ. A population-based case-crossover study of polyethylene glycol use and acute renal failure risk in the elderly. World J Gastroenterol 2011; 17(5): 651-656
- URL: https://www.wjgnet.com/1007-9327/full/v17/i5/651.htm
- DOI: https://dx.doi.org/10.3748/wjg.v17.i5.651