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Sex inequality in kidney transplantation rates

Schaubel DE, Stewart DE, Morrison HI, Zimmerman DL, Cameron JI, Jeffery JJ, et al.

Arch. Intern. Med., 2000 8 6;160(15):2349-54.
PMID: 10927733 DOI: 10.1001/archinte.160.15.2349

BACKGROUND: Men in the United States undergoing renal replacement therapy are more likely than women to receive a kidney transplant. However, the ability to pay may, in part, be responsible for this finding.

OBJECTIVE: To compare adult male and female transplantation rates in a setting in which equal access to medical treatment is assumed.

METHODS: Using data from the Canadian Organ Replacement Register, the rate of first transplantations was computed for the 20, 131 men and the 13,458 women aged 20 years or older who initiated renal replacement therapy between January 1, 1981, and December 31, 1996. Poisson regression analysis was used to estimate the male-female transplantation rate ratio, adjusting for age, race, province, calendar period, underlying disease leading to renal failure, and dialytic modality. Actuarial survival methods were used to compare transplantation probability for covariable-matched cohorts of men and women.

RESULTS: Men experienced 20% greater covariable-adjusted kidney transplantation rates relative to women (rate ratio, 1.20; 95% confidence interval, 1.13-1.27). The sex disparity was stronger for cadaveric transplants (rate ratio, 1.23) compared with those from living donors (rate ratio, 1.10). The 5-year probability of receiving a transplant was 47% for men and 39% for women within covariable-matched cohorts (P
The enigma of hypertensive ESRD: observations on incidence and trends in 18 European, Canadian, and Asian-Pacific populations, 1998 to 2002

Stewart JH, McCredie MR, Williams SM, Canadian Organ Replacement Register, Fenton SS, Trpeski L, et al.

Am J Kidney Dis, 2006 Aug;48(2):183-91.
PMID: 16860183

BACKGROUND: Despite improved treatment of hypertension and decreasing rates of stroke and coronary heart disease, the reported incidence of hypertensive end-stage renal disease (ESRD) increased during the 1990s. However, bias, particularly from variations in acceptance into ESRD treatment (ascertainment) and diagnosis (classification), has been a major source of error when comparing ESRD incidences or estimating trends.
METHODS: Age-standardized rates were calculated in persons aged 30 to 44, 45 to 64, and 65 to 74 years for 15 countries or regions (separately for the Europid and non-Europid populations of Canada, Australia, and New Zealand), and temporal trends were estimated by means of Poisson regression. For 10 countries or regions, population-based estimates of mean systolic blood pressures and prevalences of hypertension were extracted from published sources.
RESULTS: Hypertensive ESRD, comprising ESRD attributed to essential hypertension or renal artery occlusion, was least common in Finland, non-Aboriginal Australians, and non-Polynesian New Zealanders; intermediate in most European and Canadian populations; and most common in Aboriginal Australians and New Zealand Maori and Pacific Island people. Rates correlated with the incidence of all other nondiabetic ESRD, but not with diabetic ESRD or community rates of hypertension. Between 1998 and 2002, hypertensive ESRD did not increase in Northwestern Europe or non-Aboriginal Canadians, although it did so in Australia.
CONCLUSION: Despite the likelihood of classification bias, the probability remains of significant variation in incidence of hypertensive ESRD within the group of Europid populations. These between-population differences are not explained by community rates of hypertension or ascertainment bias.

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