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Biomedical subjects

R Bertell

Publications and source records attributed to R Bertell.

10 recordsLinked to original sources
PubMed2001

Dangers and unreliability of mammography: breast examination is a safe, effective, and practical alternative.

Mammography screening is a profit-driven technology posing risks compounded by unreliability. In striking contrast, annual clinical breast examination (CBE) by a trained health professional, together with monthly breast self-examination (BSE), is safe, at least as effective, and low in cost. International programs for training nurses how to perform CBE and teach BSE are critical and overdue.

Adult↗
PubMed1990

Letter from Ipoh.

Explore the source record for details and available documents.

Abnormalities, Radiation-Induced↗
PubMed1979

The nuclear worker and ionizing radiation.

Research on medical X-ray exposure sheds light on the health effects expected for workers exposed to ionizing radiation. Factual information confirming this relationship and also demonstrating the need for reviewing permissible exposure levels for workers is given. Suggestions for more sophisticated health monitoring of workers exposed to hazardous technologies are made, and the question of occupational hazards which threaten the worker's family is raised.

Background Radiation↗
PubMed1977

X-ray exposure and premature aging.

An hypothesis of an aging effect of exposure to ionizing radiation in humans is proposed and given precise mathematical expression. The assumption is made that the biological changes which occur when humans are exposed to ionizing radiation from medical x ray are comparable to those occuring through the natural aging process, since both factors are known to increase the relative risk of nonlymphatic leukemia. This assumption focuses on this one aspect of aging only. The hypothesis that aging and exposure to ionizing radiation are comparable for increasing the relative risk of non-lymphatic leukemia is tested against the data from the Tri-State Leukemia Survey. It is shown to explain the data in a statistically acceptable way, giving an estimate of 1 rad skin dose exposure to the trunk as comparable to 1 year natural aging. This research raises further questions concerning the effects of exposure to ionizing radiation, and presents a new methodology by which these questions may be researched.

Adolescent↗
PubMed1975

An alternate method for calculating an odds ratio.

Methodological problems involved in the use of the standard Woolf-Haldane analysis of epidemiological retrospective studies are examined and an alternate method of analysis is proposed. This alternate method involves a population constructed to match the cases in numerical size and to match the controls in proportion of exposures. This method allows for finer subclassification of the data and provides a meaningful summary estimate of the relative risk. The proposed method is contrasted with the Woolf-Haldane method in the analysis of the relative risk of exposure to sick pet bird versus no pet bird for adult leukemia cases versus controls. Data is from the Tri-State Leukemia Survey. Mathematical considerations involved are contained in the appendices.

Epidemiologic Methods↗