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Shortly thereafter, they were interviewed face-to-face by a professional interviewer about their occupational history, medical history and use of prescribed and nonprescribed drugs. Medical records were reviewed for information about comorbid conditions and laboratory values since http://en.wikipedia.org/wiki/MRIP inclusion, until death or to the end of follow-up (1 June 2003). To obtain the required information, including dates of death and emigration, the cohort file was linked to the continuously updated national population and death registries. The individually unique national registration numbers, assigned to all Swedish citizens at birth or immigration, ensured correct matching. We also linked the cohort to the Swedish Renal Registry, a national register for all patients starting RRT in Sweden that contains information on the date of RRT start, mode of dialysis treatment and kidney transplantation date [14]. For each patient, eGFR was calculated at several points along the disease trajectory during follow-up using the Modification of Diet in Renal Disease (MDRD) equation: eGFR?=?186?��?(S-Cr)?1.154�� (age)?0.203�� (0.742 if patient is female)?��?(1.212 if patient is black) [15]. The S-Cr determinations were part of routine care and varied in number and timing (median number per patient 5.3, range 1�C6). The timing of dialysis start was defined in terms of eGFR value, and we used the last value before initiation to decide whether it was early or late. However, if http://www.selleckchem.com/products/pf-06463922.html the latest S-Cr determination http://www.selleckchem.com/products/AZD1152-HQPA.html was >30?days before dialysis start, we inferred the last eGFR value from the last S-Cr value and the individual progression rate of the patient (see ��Statistical methods��). Patients were censored at the date of the latest S-Cr if that value was obtained >2?years before the end of follow-up. To be consistent with other studies [7, 9], we defined early and late initiation as start of dialysis with an eGFR ��7.5 and 20?mL?min?1 per 1.73?m2 were regarded as not being at risk for dialysis and did not contribute to person-time thereafter. All patients provided informed consent before enrolment. The study protocol was approved by all regional ethics boards. Age at inclusion was divided into predefined categories (