The authors studied 439 postmenopausal breast cancer cases, identified in hospitals throughout western New York, with an interview schedule that considered frequency and amount ingested of 172 foods and provided data for an estimate of total calories ingested. These were compared with age-matched controls comprising a random sample of the same communities as the cases. The extensive interviews, requiring 2.0 hours on average to administer, also covered alcohol ingestion, Quetelet index, and a wide variety of reproductive factors. The authors found, as have most investigators over the past 25 years, that risk increased with increases in age at first pregnancy, decreased with increases in numbers of children and pregnancies, and increased in those with history of benign breast disease and in those with female relatives previously affected with breast cancer. Risk adjusted for potential confounders was highest among women with the lowest ingestion of carotene or a substance correlated with its ingestion. Risk was not associated with retinol ingestion. It increased with increases in Quetelet index. Fat intake, whether studied in terms of quantity or the proportion of total calories derived from fat, was not associated with risk of breast cancer. Our analyses of these factors were adjusted for age, education, and the reproductive history traits described above.

Excess weight near the time of diagnosis is a well-established risk factor for endometrial cancer; less is known about the influence of weight at earlier periods of a woman's life or weight gain in adulthood. In a case-control study in western New York State, interviews were conducted with 232 incident endometrial cancer cases, diagnosed between 1986 and 1991, and 631 community controls. Body mass index at 16 years of age and 20, 10, and 2 years before interview and changes in body mass index between these time periods were examined. While being relatively heavy at 16 years of age was associated with slightly increased risk [adjusted odds ratio (OR) = 1.28, 95% confidence interval (CI) = 0.84-1.96], large gains over the entire period from 16 years of age to 2 years ago (OR = 3.45, CI = 2.13-5.57) and high body mass index close to the time of diagnosis (OR = 3.21, CI = 2.01-5.15) were associated with greater risk. Differences in mean body mass index between cases and controls increased over time.

Chronic exposure to 60-Hz electromagnetic fields has been hypothesized to increase breast cancer risk by suppressing the normal nocturnal rise in pineal melatonin. From 1987 to 1989 in western New York the authors investigated the use of electric blankets as a risk factor for breast cancer in a case-control study of postmenopausal women aged 41-85 years. A study population of 382 cases and 439 randomly selected community controls was queried regarding use in the previous 10 years, the frequency of use by season, and the mode of use. After adjusting for age and education, the odds ratio (OR) for use of an electric blanket in the past 10 years (33% of cases, 35% of controls) was 0.89 (95% confidence interval (95% CI) 0.66-1.19), and the risk did not differ in a dose-response fashion by the number of years used. The risk associated with daily use relative to nonuse was 0.97 (95% CI 0.70-1.35). Use sometimes to warm the bed and sometimes throughout the night was not associated with risk (OR = 0.64, 95% CI 0.40-1.05). The risk of breast cancer among those who used the blanket continuously throughout the night was 1.31 (95% CI 0.88-1.95). Those who reported daily use in season, continuously throughout the night for the past 10 years did not have significantly elevated risk (OR = 1.25, 95% CI 0.73-2.16). Adjustment for the Quetelet index and reproductive risk factors did not alter the results. These findings do not support the hypothesis that electric blanket use is associated with an increased risk for breast cancer. The slightly elevated estimate of risk for the most frequent electric blanket users and the potential public health significance of electromagnetic field exposure suggest that further inquiries be undertaken.

Smokers employed at Roswell Park Memorial Institute, a cancer hospital and research center located in Buffalo, New York, were offered the opportunity to participate in a quit-smoking contest in which cash prizes were awarded for stopping smoking. Information on the smoking habits and attitudes of employees collected in a survey 3 months before the contest was used to predict the characteristics of smokers associated with contest participation. The same variables were also used to predict cessation among contest participants 3 months after the start of the contest. Overall, 14% of smokers enrolled in the contest, with one-third still abstinent 3 months later. Contest participation was associated with the smoker's reported desire to stop smoking and the number of symptoms related to smoking. Smoking cessation was related to the strength of the smoking habit, the confidence in the ability to quit, and the smoking status and relationship of the respondent's partner in the contest.

Recent research disclosed a number of variables which may distort blood pressure readings, but little attention has been paid to talking as such a variable. To investigate the effect of talking on diastolic blood pressure, 48 subjects with one previous diastolic blood pressure reading of 90 mm Hg or more and not taking antihypertensives, were recruited from an outpatient hypertension clinic. Three diastolic blood pressure readings under each of three sequentially counter-balanced treatment conditions were obtained: no talking, reading neutral material for part of the procedure, and reading neutral material continuously. Blood pressure increased significantly (p less than .01) under both talking conditions. Implications for nursing education, practice, and future research are discussed.