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Biomedical subjects

A R Dyer

Publications and source records attributed to A R Dyer.

113 records · Page 7Linked to original sources
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Serum cholesterol and mortality from coronary heart disease in young, middle-aged, and older men and women from three Chicago epidemiologic studies.

The association of total serum cholesterol with mortality from coronary heart disease was examined in 1210 white men aged 42 to 60 in 1959 to 1963 and 1008 white men aged 45 to 64 in 1959 to 1969, followed up to 25 years from the Chicago Peoples Gas Company Study; in 1903 white men aged 41 to 57 in 1959, followed up to 24 years from the Chicago Western Electric Company Study; and in 17,880 white men aged 25 to 74 and 8327 white women aged 40 to 74 in 1967 to 1973, followed up to 18 years from the Chicago Heart Association Detection Project in Industry. In these studies total cholesterol level was related positively to coronary mortality in young men and in middle-aged and older men and women. Relative risks of mortality were generally higher in young and middle-aged persons compared to older persons, whereas absolute excess risks were generally greater in older than in younger persons.

Adult↗
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Neuroticism and cynicism and risk of death in middle-aged men: the Western Electric Study.

MMPI measures of neuroticism (N) and of cynicism (C) were obtained at the initial examination of 1871 employed, middle-aged men in Chicago. Neither N nor C was significantly associated cross-sectionally with systolic blood pressure or serum cholesterol, but both were positively associated with cigarette smoking and alcohol consumption. N was not significantly associated with risk of death from coronary disease, other cardiovascular diseases, cancer, all other causes combined, or all causes combined after adjustment for C, age, cigarette smoking, alcohol consumption, systolic blood pressure, and serum cholesterol. C was significantly associated with coronary death and total mortality after adjustment for N and the other variables listed above, and relative risks of 1.4 to 1.6 were observed for all endpoints. These results support the idea that neuroticism is not associated with major causes of mortality, but that cynicism is associated with several causes. The associations between cynicism and mortality may be mediated by cigarette smoking and excessive alcohol consumption since adjustment for these factors may have been incomplete due to correlation between cynicism and errors in self-reported data.

Adult↗
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Can overnight urine replace 24-hour urine collection to asses salt intake?

Are overnight urine specimens adequate for characterizing the daily salt intake of individuals, i.e., can the overnight specimen replace the 24-hour specimen? Data from 142 male participants of an ongoing trial on the primary prevention of hypertension were used to examine this question with correlation analysis and quantile classification. Estimated correlation between the true mean 24-hour and the true mean overnight sodium excretion was 0.72. Furthermore, 67% of the individuals in the upper third of the distribution of true mean overnight urine sodium were also in the upper third of the distribution of true mean 24-hour sodium. Thus, these data are promising in regard to the use of overnight urine specimens for characterizing the salt intake of individuals. The number of overnight urine collections required to estimate accurately the correlation between an individual's true mean overnight urine sodium and a variable of interest (e.g., blood pressure) was calculated. Given the observed intra- and inter-individual variation, the data indicate that 14 measurements are needed to limit the diminution of the correlation coefficient to 10%.

Adult↗
PubMedDate not supplied

Recruiting young adults in an urban setting: the Chicago CARDIA experience.

The recruitment goal of Chicago Coronary Artery Risk Development in Young Adults (CARDIA) was 1,100 randomly selected young adults, in equal proportions for men and women, blacks and whites, two age groups, and two education groups. CARDIA is an ongoing multicenter study of the health and lifestyles of young adults designed to trace the development of risk factors for coronary heart disease over time. Participants completed a four-and-one-half hour exam and agreed to return two years later. In Chicago CARDIA, one of the four centers in the national collaborative study, random digit dialing of computer-generated telephone lists was the initial recruitment technique. Initial recruitment efforts resulted in too few low-socioeconomic status (SES) white participants and too few blacks. In response the sampling procedure was modified to focus on census tracts with a high density of blacks, more low-SES whites, and convenient public transportation. By being flexible, Chicago CARDIA improved recruitment in certain hard-to-fill cells and achieved the overall goals: 1,109 participants, 50% black and 50% white, near equal proportions by sex and age, and close to the recommended 40%/60% spread on education. The Chicago experience should benefit others conducting research in an urban setting.

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