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Biomedical subjects

C K Redmond

Publications and source records attributed to C K Redmond.

At least 55 records · Page 3Linked to original sources
PubMed1980

Relationship between cholecystectomy and ascending colon cancer.

A retrospective study involving 706 sample cases of large bowel cancer grouped by subsite (ascending colon, transverse colon, descending colon, sigmoid colon, ana rectum), sex, and age identified during the Third National Cancer Survey (Pittsburgh SMSA, 1969--1971) was recently completed. The basic strategy of this comparative study was to determine whether the frequency distribution patterns of both demorgraphic characteristics and environmental factors differed among persons with subsite-specific cancer of the large bowel. Based on the information provided in the hospital records there was a gradient of previous cholecystectomy history from ascending colon cancer (10.5%) to rectal cancer (2.1%) in those patient records whose only gastrointestinal surgery indicated was cholecystectomy. For patient records in which the only surgical operation was cholecystectomy, or cholecystectomy plus other gastrointestinal surgery, the gradient persisted as one moved from the right to the left subsites of the large bowel. No relationship with respect to other types of gastrointestinal surgery was observed. It is clear, however, that a bias associated with the review of hospital records can account for this relationship and, therefore, the finding may be spurious. On the other hand, there is increasing evidence of a relationship between bile acid metabolism and carcinoma of the colon. It might be considered that the right side of the colon would be most likely affected by the potential carcinogenic effect of certain bile acid metabolites.

Adult↗
PubMed1978

Evaluation of multiple causes of death in occupational mortality studies.

An exploratory examination of the possibility of using multiple causes of death information from death certificates in mortality studies has been undertaken. The formation of a matrix of primary by contributory causes has been suggested. The matrix gives an overall picture of mortality patterns, serves as a scheme to identify disease combinations, and can be utilized as a data-editing device. From the matrix, several conventional, as well as several new statistics can be computed. The methodology has been illustrated with data from a cohort of steelworkers. The gain in information as a result of routinely recording multiple causes of death has also been discussed.

Age Factors↗
PubMed1978

The use of retirees to evaluate occupational hazards. II. Comparison of cause specific mortality by work area.

This article compared the results of mortality studies in three work areas of the steel industry for the total cohort of workers and for the retirees. This was done to determine further the usefulness and the limitations of retiree studies for occupational mortality studies. The major findings are: 1. Retiree studies detect occupational hazards such as respiratory cancers and nonmalignant respiratory diseases, although the estimated average relative risk will tend, for obvious reasons, to be greater than for the total cohort. 2. Some problems associated with the use of retirees for occupational mortality studies were also discussed. These problems included small sample sizes, the retiree study not indicating significant excess deaths from certain diseases because the excess mortality took place in the younger ages, and differences between the estimates of risk for the retiree study and the total cohort study. 3. The estimates of risk for the studies using all men over age 65 did not vary from the estimates of risk for the total cohort as much as the risks from the retirees did. However, other than the variation seen in the estimates of risk, the exclusion of nonretirees from the retiree study did not seem to affect the overall conclusions. Based on the findings of this study, it was concluded that retiree studies may sometimes be useful tools in detecting occupational hazards when cost and time definitely preclude more comprehensive studies, but that one should be aware of the greater possibility of spurious negative findings due to the limited age group being studied and the smaller sample sizes.

Aged↗
PubMed1977

Factors related to the incidence of stomach cancer in the Pittsburgh Standard Metropolitan Statistical Area.

This report presents an analysis of several demographic discriminants of stomach cancer incidence for residents of the Pittsburgh Standard Metropolitan Statistical Area (SMSA) with the use of data collected as part of the Third National Cancer Survey, 1969-71. The Pittsburgh SMSA, one of nine areas included in the Third National Cancer Survey, was of particular interest in the study of stomach cancer, since area residents showed the highest age-adjusted incidence rate for cancer of this site while showing the fifth highest rate for all sites. To examine the data in greater detail, we used the variables of sex, race, nativity, and median income level to classify the cancer patients into homogeneous subgroups of census tracts of residence to allow comparisons of the average annual age-adjusted incidence rates among the groups. The data indicated that Pittsburgh SMSA residents showed stomach cancer incidence patterns that were generally consistent with earlier published reports; particularly when contrasted with appropriate population subgroups, higher rates appeared for males, for blacks, for lower income areas, and for areas with "large" proportions of foreign-born and foreign-stock residents. Furthermore, when one considered interactions among the factors, the relationship between ethnic composition and incidence appeared to supercede that of income among white males.

Adult↗
PubMed1976

Long-term mortality study of steelworkers.

This study examines the cause-specific mortality of men employed as masons in the steel industry. Their mortality experience is compared with the mortality predicted by the age--and race--specific death rates for a control group consisting of those steelworkers whose first job in 1953 was not in the mason department. The relative risks of dying from selected causes were highly dependent on race. The most important observations are: (1) The nonwhites have an overall excess risk when compared to the nonmason group. This excess is not confined to any particular category and appears to be due to the cumulative effect of an excess in many different categories. (2) The white masons have an excess risk for nonmalignant respiratory disease. Furthermore, this risk increases with length of exposure. (3) The whites have an excess risk for respiratory cancer when compared to the nonmason group. This excess is not present in the later years of the follow-up period. (4) The interpretation of the findings for cardiovascular disease remain unclear. Results for cerebral vascular disease and hypertensive disease in nonwhites are suggestive, but need further investigation before any strong statements can be made.

Adult↗
PubMed1976

Cancer experience among coke by-product workers.

This paper presents the site-specific cancer mortality, 1953-1966, for men employed in by-product coke plants in Allegheny County, Pa. Approximate relative risks, which take into account race, age, and calendar years of follow-up, have been calculated for various work areas of the coke plant. The major findings are: 1. As indicated previously by Lloyd and Redmond, men with five or more years at the coke ovens have an excess risk of dying from lung cancer and kidney cancer. 2. Cancers of the digestive system are significantly elevated in nonoven workers. Cancers of two sites, the colon and pancreas, account for the total excess in cancers of the digestive system. 3. Cancers of the buccal cavity and pharynx appear high in nonoven workers, although the number of deaths involved is small. These observations clearly indicate the need to consider nonoven as well as oven workers when evaluating cancer hazards in the coke plant.

Age Factors↗
PubMed1975

Heart disease mortality among black migrants: a study of Ohio residents (1960-1967).

In a demographic study, the black Ohio residents were characterized by those born in Ohio and those born in other regions of the United States, and comparisons were made of rates for all deaths (1960-1967) for coronary heart disease (420), endocarditis and myocardial degeneration (421-422), hypertensive cardiovascular diseases (440-447), cerebrovascular diseases (300-334), cardiovascular diseases (400-468), and total diseases of the cardiovascular system (300-334) (400-468). The division of the total United States-born Ohio residents by region of birth provided marked differences in the age-adjusted rates in the relative comparisons. The black males and females born in the South had a markedly higher age-adjusted death rate (ages 45 to 64) than those born in Ohio in each of the categories of cardiovascular diseases studied. For coronary heart disease, the age-adjusted death rate for the black males showed a marked excess over the black females, for each region of birth, whereas for hypertensive cardiovascular diseases the black males and females had similar age-adjusted rates for each region of birth. The findings indicate a carry-over among the black of a higher cardiovascular risk among those born in the South and lend support to the concept of the influence of the endemic factors in the early years of life. In the prospective study of black steelworkers, it was observed that migrant and nonmigrant workers had approximately the same mortality for cardiovascular disease overall, and when specific work areas were considered. Selective factors of employment, of medical screening, and capability of continued employment in strenuous environments, were considered the most likely basis for the similar mortality experience.

Age Factors↗
PubMed1975

Long-term mortality experience of steelworkers. VIII. Mortality patterns of open hearth steelworkers (a preliminary report).

The findings in this report of a deficit in mortality from cardiovascular diseases and an excess in diseases of the digestive system among open hearth workers indicate the need for further study of men working in hot environments. In future reports we hope to refine the comparisons by obtaining data which will enable classification of workers more precisely by intensity and duration of exposure within the open hearth. Of particular importance in future work are the evaluation of possible relationships between the actual levels of heat exposure and subsequent morbidity and mortality, as well as possible interactions between heat stress and physical exertion in terms of the incidence of heart disease and other select diseases.

Alloys↗
PubMed1975

Long-term mortality study of steelworkers. IX. Mortality patterns among sheet and tin mill workers.

As a result of findings of an earlier report in this series, this study examines the updated cause-specific mortality of men employed in the sheet and tin mill areas of the steel industry. In order to investigate possible relationships between occupational responsibilities or exposures and mortality from specific causes, the sheet and tin mills have been subdivided into 13 mutually exclusive work areas. Detailed analysis is limited primarily to white workers due to the small number of nonwhites in these areas. The most important observations are: 1. Increased overall mortality appears for men employed in 1953 in the sheet finishing and shipping area, confirming the findings of Lloyd, et al. The earlier observation of a significant excess in deaths from vascular lesions of the central nervous system does not hold over time. The previously noted excess for this cause may be related to selective factors or an extreme chance observation. The excess in mortality from all causes of death, which occurs over several disease categories, may not be a result of occupational exposures, but rather some selectivity. 2. Significant excesses in mortality from arteriosclerotic heart disease are noted among men employed in batch pickling and sheet dryer operations, which is in agreement with the earlier findings. Increased risks of dying from hypertensive heart disease are seen in the coating area. 3. Cancer of the lymphatic and hematopoietic tissues is found to be a significant source of excess mortality for workers in the heat treating and forging and tin finishing and shipping work areas. 4. Steelworkers employed in the annealing-normalizing work area show an excess in deaths from nonmalignant respiratory diseases, primarily pneumonia. Further study in these areas should attempt to investigate whether factors in the work environment may be responsible for the observed excess mortalities. More specifically, work should be done to find out whether men employed in heat treating and forging and tin finishing and shipping work in close proximity to chemicals or radiation exposure and whether workers employed in the annealing-normalizing area are exposed to any kind of oil, vapor, or chemical which might be irritating or infectious to the respiratory system. A similar analysis for men working in the batch pickling and sheet dryers and coating areas would also be worthwhile. The main emphasis of any future study should lie upon investigating whether the observed excess mortalities are due to any environmental factor, selection for health, or random fluctuation.

Alloys↗