Biomedical subjects

C A Derby

Publications and source records attributed to C A Derby.

At least 19 recordsLinked to original sources

PubMed2006

A genotype of exceptional longevity is associated with preservation of cognitive function.

OBJECTIVE: To test whether cholesterol ester transfer protein (CETP) genotype (VV homozygosity for I405V) is associated with preservation of cognitive function in addition to its association with exceptional longevity. METHODS: We studied Ashkenazi Jews with exceptional longevity (n = 158; age 99.2 +/- 0.3 years) for the associations of CETP VV genotype and lipoprotein phenotype, using the Mini-Mental State Examination (MMSE). To confirm the role of CETP in a younger cohort, we studied subjects from the Einstein Aging Study (EAS) for associations between CETP VV and cognitive impairment. RESULTS: Subjects with MMSE > 25 were twice as likely to have the CETP VV genotype (29% vs 14%, p = 0.02), and those with the VV genotype were more likely (61% vs 30%, p = 0.02) to have MMSE > 25. Subjects with the VV genotype had lower levels of CETP (1.73 +/- 0.11 vs 2.12 +/- 0.10 mug/mL, p = 0.01), higher high-density lipoprotein (HDL) levels (p = 0.02), and larger lipoprotein particles (p = 0.03). In the EAS cohort, an approximately fivefold increase in the VV genotype (21% vs 4%, p = 0.02), higher HDL levels, and larger lipoprotein particle sizes were associated with less dementia and improved memory. CONCLUSIONS: Using two independent cohorts, we implicate the longevity CETP gene as a modulator of age-related cognitive function. A specific CETP genotype is associated with lower CETP levels and a favorable lipoprotein profile. It has not been determined whether modulation of this gene prevents age-related decline or AD.

Age Distribution↗

PubMed2005

A new screening tool for cervical dystonia.

BACKGROUND: Family studies of dystonia may be limited in part by small family size and incomplete ascertainment of dystonia in geographically dispersed families. Further, prevalence estimates of dystonia are believed to be underestimates, as most studies are clinic-based and many individuals do not present to a physician or are misdiagnosed. As a low-cost highly sensitive screening tool is needed to improve case detection for genetic and epidemiologic studies, the authors developed the Beth Israel Dystonia Screen (BIDS), a computer-assisted telephone interview. OBJECTIVE: To evaluate the validity and utility of a computer-assisted telephone interview in screening for cervical dystonia. METHODS: The BIDS was administered and videotaped neurologic examinations performed on 193 individuals from 16 families with cervical and cranial dystonia. With use of a final rating of definite dystonia, as determined by video review of a systematic neurologic evaluation, as the gold standard, the predictive value of a subset of questions from the BIDS was assessed. RESULTS: A positive response to at least two of five screening questions had a sensitivity for cervical dystonia of 100% and a specificity of 92%. With use of a positive response to three or more questions, definite dystonia was determined with 81% sensitivity and 97% specificity. CONCLUSIONS: The Beth Israel Dystonia Screen (BIDS) identifies cervical dystonia with excellent sensitivity and specificity in a family-based sample. The authors recommend the BIDS for family studies, but cross-validation in a population sample is advisable before applying this method to epidemiologic studies.

Adolescent↗

PubMed2001

Lower standing systolic blood pressure as a predictor of falls in the elderly: a community-based prospective study.

OBJECTIVES: We investigated prospectively the relationships among falls, physical balance, and standing and supine blood pressure (BP) in elderly persons. BACKGROUND: Falls occur often and adversely affect the activities of daily living in the elderly; however, their relationship to BP has not been clarified thoroughly. METHODS: A total of 266 community-dwelling elderly persons age 65 years or over (123 men and 143 women, mean age of 76 years) were selected from among residents of Coop City, Bronx, New York. Balance was evaluated at baseline using computerized dynamic posturography (DPG). During a one-year follow-up, we collected information on subsequent falls on a monthly basis by postcard and telephone follow-up. RESULTS: One or more falls occurred in 60 subjects (22%) during the one-year follow-up. Women fell more frequently than men (28% vs. 16%, p < 0.03), and fallers were younger than nonfallers. Fallers (n = 60) had lower systolic BP (SBP) levels when compared with nonfallers (n = 206) (128 +/- 17 vs. 137 +/- 22 mm Hg for standing, p < 0.006; 137 +/- 16 vs. 144 +/- 22 mm Hg for lying, p < 0.02), whereas diastolic BP was not related to falls. Falls occurred 2.8 times more often in the lower BP subgroup (<140 mm Hg for standing SBP) than in the higher BP subgroup (> or =140 mm Hg, p < 0.0003), and gender-related differences were observed (p = 0.006): 3.4 times for women (p < 0.0001) versus 1.9 times for men (p = 0.30). Loss of balance, as detected by DPG, did not predict future falls and was also not associated with baseline BP levels. Multiple logistic regression analysis demonstrated that female gender (relative risk [RR] = 2.1, p = 0.02), history of falls (RR = 2.5, p = 0.008) and lower standing SBP level (RR = 0.78 for 10 mm Hg increase, p = 0.005) were independent predictors of falls during one year of follow-up. CONCLUSIONS: Lower standing SBP, even within normotensive ranges, was an independent predictor of falls in the community-dwelling elderly. Elderly women with a history of falls and with lower SBP levels should have more attention paid to the prevention of falls and related accidents.

Accidental Falls↗

PubMed2001

Possible effect of DRGs on the classification of stroke: implications for epidemiological surveillance.

BACKGROUND AND PURPOSE: Accurate data on the distribution of stroke subtypes are essential for understanding the forces driving recent morbidity and mortality trends. The introduction of diagnosis-related groups (DRGs) in the 1980s may have affected the distribution of stroke subtypes as defined by International Classification of Diseases, Ninth Revision (ICD-9), discharge diagnosis codes. METHODS: The Pawtucket Heart Health Program cardiovascular surveillance data were used to examine trends in stroke classification for 1980 to 1991 in relation to the introduction of DRGs in 2 communities in Massachusetts and Rhode Island, where DRGs were implemented 2 years apart. Included were all hospital discharges for residents aged 35 to 74 with a primary ICD-9 diagnosis of 431 to 432, 434, or 436 to 437 (N=1386 in Rhode Island, N=1839 in Massachusetts). RESULTS: In each state, concurrently with the introduction of DRGs, the proportion of strokes classified as cerebral occlusion (ICD-9 434.0 to 434.9) increased, and the proportion classified as acute but ill-defined (ICD-9 436.0 to 436.9) decreased. Before DRGs, 30.0% of strokes in Rhode Island and 26.6% in Massachusetts were classified as cerebral occlusion, whereas 51.8% in Rhode Island and 51.7% in Massachusetts were classified as acute ill defined. After DRGs were instituted, the proportions of cerebral occlusion and acute, ill-defined stroke, respectively, were 70.9% and 8.5% in Rhode Island and 74.1% and 7.7% in Massachusetts (chi(2), all P<0.001). The proportions of strokes classified as intracerebral hemorrhage or transient cerebral ischemia remained constant. CONCLUSIONS: The implementation of DRGs may have influenced coding of strokes to the ICD-9. Findings highlight the limitations of hospital discharge data for evaluating stroke subtypes and demonstrate the need for community-based surveillance for monitoring specific trends in stroke.

Adult↗

PubMed2001

Drug therapy and prevalence of erectile dysfunction in the Massachusetts Male Aging Study cohort.

STUDY OBJECTIVE: To examine the association of commonly used drugs with erectile dysfunction (ED) at two time points. DESIGN: Population-based, cross-sectional, survey analysis. PARTICIPANTS: Randomly selected cohort of men in the Massachusetts Male Aging Study (MMAS) that included 1476 men for the baseline (1987-1989) and 922 for the follow-up (1995-1997) analyses. INTERVENTION: Crude associations between specific drug categories were examined with chi2 statistics. Logistic regression analysis was used to separate the effect of drugs from the influence of heart disease, hypertension, untreated diabetes, or depressive symptoms. MEASUREMENTS AND MAIN RESULTS: In the MMAS, medical history, current drug use, and erectile function status were ascertained with in-home interviews. In unadjusted analyses, thiazide and nonthiazide diuretics, beta-blockers, calcium channel blockers, angiotensin-converting enzyme inhibitors, benzodiazepines, digitalis, nitrates, 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors, and histamine2 receptor antagonists were associated with prevalent ED. Adjustment for comorbidities and health behaviors attenuated these associations, with only nonthiazide diuretics and benzodiazepines remaining statistically significant. CONCLUSION: Several common drugs may increase prevalence of ED; however, additional data from larger populations are needed to determine whether these associations are independent of underlying health conditions and to explore the effects of dosage and duration of use.

Adult↗

PubMed2000

Relation between psychosocial risk factors and incident erectile dysfunction: prospective results from the Massachusetts Male Aging Study.

Erectile dysfunction (ED) is recognized as a major public health problem. ED may be due to a wide range of factors, but recent work has focused on the medical and physical etiology of ED. The importance of psychosocial risk factors should not be dismissed, however, and several cross-sectional studies have reported associations between ED and depression, anger, and dominance. Whether these factors are prospectively associated with the risk of ED has yet to be established. Longitudinal data obtained from 776 respondents in the Massachusetts Male Aging Study (1987-1997) were used to examine whether the presence of depressive symptoms, the way in which anger was expressed, or the trait of dominance independently contributed to the risk of ED 8.8 years later. The results suggest that new cases of ED are much more likely to occur among men who exhibit a submissive personality. The implications of these findings are discussed.

Adult↗

PubMed2000

Modifiable risk factors and erectile dysfunction: can lifestyle changes modify risk?

OBJECTIVES: To prospectively examine whether changes in smoking, heavy alcohol consumption, sedentary lifestyle, and obesity are associated with the risk of erectile dysfunction. METHODS: Data were collected as part of a cohort study of a random sample of men 40 to 70 years old, selected from street listings in the Boston Metropolitan Area, Massachusetts. In-home interviews were completed by 1709 men at baseline in 1987 to 1989 and 1156 men at follow-up in 1995 to 1997 (average follow-up 8.8 years). Analyses included 593 men without erectile dysfunction at baseline, who were free of prostate cancer, and had not been treated for heart disease or diabetes. The incidence of moderate to complete erectile dysfunction was determined by discriminant analysis of responses to a self-administered sexual function questionnaire. RESULTS: Obesity status was associated with erectile dysfunction (P = 0.006), with baseline obesity predicting a higher risk regardless of follow-up weight loss. Physical activity status was associated with erectile dysfunction (P = 0.01), with the highest risk among men who remained sedentary and the lowest among those who remained active or initiated physical activity. Changes in smoking and alcohol consumption were not associated with the incidence of erectile dysfunction (P >0.3). CONCLUSIONS: Midlife changes may be too late to reverse the effects of smoking, obesity, and alcohol consumption on erectile dysfunction. In contrast, physical activity may reduce the risk of erectile dysfunction even if initiated in midlife. Early adoption of healthy lifestyles may be the best approach to reducing the burden of erectile dysfunction on the health and well-being of older men.

Adult↗

PubMed2000

Sex-specific trends in validated coronary heart disease rates in southeastern New England, 1980-1991.

Although the national decline in coronary heart disease mortality began earlier and was steeper in women relative to men, recent data suggest that the decline in women has slowed. The purpose of this study was to document sex-specific trends in coronary disease morbidity and mortality for the period 1980-1991 in two southeastern New England communities, and to determine whether temporal trends have been similar in men and women aged 35-74 years. Analyses were based on 6,282 validated in-hospital and out-of-hospital coronary disease events ascertained by the retrospective surveillance system of the Pawtucket Heart Health Program. Total (fatal plus non-fatal) coronary disease rates remained stable during this period. The flat trend was the result of an increase in non-fatal hospitalizations and a simultaneous decrease in both in-hospital and out-of-hospital mortality. The decline in fatal coronary disease was steeper for men, for both in- and out-of-hospital mortality, although the sex difference was statistically significant only for out-of-hospital deaths. In-hospital case-fatality for validated coronary disease declined for both men and women. The steeper decline in coronary disease mortality for men suggests the need for more information regarding sex differential trends in prevention, diagnosis, classification, and treatment.

Adult↗

PubMed2000

Erectile dysfunction and coronary risk factors: prospective results from the Massachusetts male aging study.

BACKGROUND: Erectile dysfunction (ED), a wide spread and troublesome condition among middle-aged men, is partly vascular in origin. In the Massachusetts Male Aging Study, a random-sample cohort study, we investigated the relationship between baseline risk factors for coronary heart disease and subsequent ED, on the premise that subclinical arterial insufficiency might be manifested as ED. METHODS: Men ages 40-70, selected from state census lists, were interviewed in 1987-1989 and reinterviewed in 1995-1997. Data were collected and blood was drawn in participants' homes. ED was assessed from responses to a privately self-administered questionnaire. Analysis was restricted to 513 men with no ED at baseline and no diabetes, heart disease, or related medications at either time. RESULTS: Cigarette smoking at baseline almost doubled the likelihood of moderate or complete ED at followup (24% vs. 14%, adjusted for age and covariates, P = 0.01). Cigar smoking and passive exposure to cigarette smoke also significantly predicted incident ED, as did overweight (body-mass index > or =28 kg/m(2)) and a composite coronary risk score. Weaker prospective associations were seen for hypertension and dietary intake of cholesterol and unsaturated fat. CONCLUSIONS: Erectile dysfunction and coronary heart disease share some behaviorally modifiable determinants in men who, like our sample, are free of manifest ED or predisposing illness. Open questions include whether modification of coronary risk factors can prevent ED and whether ED may serve as a sentinel event for coronary disease.

Adult↗

PubMed2000

A new surrogate variable for erectile dysfunction status in the Massachusetts male aging study.

Erectile dysfunction (ED) is the subject of a vast clinical literature, but little information has been gathered from random samples of the general public. The Massachusetts Male Aging Study (MMAS) addressed this important aspect of men's health. The MMAS was conducted in two waves, with baseline data collection in 1987-1989 and follow-up in 1995-1997. Subsequent to the baseline MMAS survey, a consensus developed that subjective measures are optimal for defining ED. Unfortunately, the baseline questionnaire did not ask subjects directly about their erectile functioning. Thus, we previously assigned the MMAS subjects a degree of impotence at baseline using a series of related questions, employing a discriminant formula constructed from a separate sample of urology clinic patients. At follow-up the men classified themselves directly in addition to answering the original series of related questions. In the present article, we report the results of a new discriminant function, based on the MMAS men at follow-up. We also compare the two methods and discuss our reasons for preferring the internally calibrated method.

Cross-Sectional Studies↗

PubMed2000

Measurement of erectile dysfunction in population-based studies: the use of a single question self-assessment in the Massachusetts Male Aging Study.

A concise, reliable means of assessing erectile dysfunction (ED) in large, multidisciplinary population-based studies is needed. A single, direct question for self-assessed ED was assessed in the population-based sample of the Massachusetts Male Aging Study (MMAS). Of the 1156 respondents to the 1995-97 MMAS follow-up evaluation, 505 were randomly selected to complete either the International Index of Erectile Function (IIEF) (n = 254), or the Brief Male Sexual Function Inventory (BMSFI) (n = 251), in addition to the single question self-assessment. The proportion not classified due to missing data was MMAS-9%, BMSFI-8%, and IIEF-18%. The single question correlated well with these other measures (r = 0.71-0.78, P < 0.001). Prevalence was similar to that based on the IIEF, agreement was moderate (kappa = 0.56-0.58), and associations with previously identified risk factors were similar for each classification. Thus, the MMAS single question may be a practical tool for population-based studies where detailed clinical measures of ED are impractical.

Adult↗

PubMed2000

Trends in validated cases of fatal and nonfatal stroke, stroke classification, and risk factors in southeastern New England, 1980 to 1991 : data from the Pawtucket Heart Health Program.

BACKGROUND AND PURPOSE: Recent US data suggest there is a slowing of the decline in stroke mortality rates, accompanied by a constant morbidity rate. Hospital discharge rates for patients with stroke are influenced by numerous factors, and community-based surveillance data for validated cases are rare. Thus, reasons for the observed trends remain unclear. In the present study, we examined trends in validated cases of stroke for 1980 to 1991 in the combined populations of the Pawtucket Heart Health Program study communities and examined concomitant trends in classification, use of diagnostic procedures, and levels of risk factors. METHODS: Discharges for residents aged 35 to 74 years with International Classification of Diseases, Ninth Revision codes 431, 432, and 434 to 437 were identified through retrospective surveillance. A physician reviewed the medical records to validate case status. RESULTS: Between 1980 and 1991, 2269 discharges were confirmed as representing definite or probable strokes (59.5% of 3811 cases reviewed). The fatal stroke rate declined (P<0.005) and the nonfatal stroke rate remained constant in both sexes. Case-fatality rates declined significantly (P=0.003), and among strokes, the relative odds of death in 1990 versus 1980 was 0.50 (95% CI 0.34 to 0.72). The proportion of stroke discharges in which the patient received a CT scan or MRI increased 120%, and fewer strokes were classified as ill defined. Hypertension prevalence, treatment, and control rates remained constant in these populations. CONCLUSIONS: Although causes for the observed trends remain unclear, results suggest that the decline in mortality rates is due to improved survival rates for patients with stroke. However, constant morbidity rates combined with constant rates of hypertension highlight the need for improved prevention to reduce the impact of stroke.

Adult↗

PubMed2000

Incidence of erectile dysfunction in men 40 to 69 years old: longitudinal results from the Massachusetts male aging study.

PURPOSE: We estimated the incidence of erectile dysfunction in men 40 to 69 years old at study entry during an average 8.8-year followup, and determined how risk varied with age, socioeconomic status and medical conditions. MATERIALS AND METHODS: Data from a randomly sampled population based longitudinal study of Massachusetts men were analyzed. A total of 1,709 men completed the baseline interview during 1987 to 1989 and 1,156 survivors completed followup from 1995 to 1997. The analysis sample consisted of 847 men without erectile dysfunction at baseline and with complete followup information. Erectile dysfunction was assessed by discriminant analysis of 13 questions from a self-administered sexual function questionnaire and a single global self-rating question. RESULTS: The crude incidence rate for erectile dysfunction was 25.9 cases per 1,000 man-years (95% confidence interval [CI] 22.5 to 29.9). The annual incidence rate increased with each decade of age and was 12.4 cases per 1,000 man-years (95% CI 9.0 to 16.9), 29.8 (24.0 to 37.0) and 46.4 (36.9 to 58.4) for men 40 to 49, 50 to 59 and 60 to 69 years old, respectively. The age adjusted risk of erectile dysfunction was higher for men with lower education, diabetes, heart disease and hypertension. Population projections for men 40 to 69 years old suggest that 17,781 new cases of erectile dysfunction in Massachusetts and 617,715 in the United States (white males only) are expected annually. CONCLUSIONS: Although prevalence estimates and cross-sectional correlates of erectile dysfunction have recently been established, incidence estimates were lacking. Incidence is necessary to assess risk, and plan treatment and prevention strategies. The risk of erectile dysfunction was about 26 cases per 1,000 men annually, and increased with age, lower education, diabetes, heart disease and hypertension.

Adult↗

PubMed1998

HDL cholesterol: trends in two southeastern New England communities, 1981-1993.

PURPOSE: Although public health interventions have not specifically targeted high density lipoprotein (HDL) cholesterol, observed changes in the prevalence of other cardiovascular risk factors would be expected to have differential effects on HDL. This study examined secular trends in HDL in relation to changes in other cardiovascular risk factors for the years 1981 through 1993 in the Pawtucket Heart Health Program (PHHP) study communities. METHODS: Nonfasting HDL levels were assessed in 12,223 respondents to six biennial population random sample surveys. RESULTS: Between 1981 and 1993, mean HDL cholesterol declined by 0.08 mmol/L in both men and women after adjustment for age, city, education, hormone use, medications, recent alcohol use, smoking, regular exercise, body mass index (BMI), and total cholesterol, (p for trend < 0.001). There was no apparent laboratory explanation for the trend which occurred concurrent with decreased smoking prevalence, increasing BMI and decreased prevalence of recent alcohol use. Decreasing HDL cholesterol was observed consistently across subgroups defined by smoking, alcohol use and BMI. CONCLUSIONS: Although several favorable cardiovascular risk factor trends have been observed in recent decades, declining HDL cholesterol is also of interest, particularly in conjunction with population increases in BMI.

Adult↗

PubMed1997

Dietary factors in relation to weight change among men and women from two southeastern New England communities.

OBJECTIVE: Dietary factors, independent of total energy, may be important in promoting obesity. We examined prospectively the relationship between baseline diet composition and weight gain among adult men and women from southeastern New England. DESIGN: The prospective association of nutrient consumption and weight change was examined in a randomly selected cohort examined four years apart. SUBJECTS: Adults aged 18 through 64 years from two communities in Southeastern New England were randomly selected for the study after being interviewed in their homes. The present investigation is based on a subgroup of 465 individuals who completed a food-frequency questionnaire in 1986 or 1987 and were reinterviewed four years later. STATISTICAL ANALYSES: Multiple regression analyses were used to determine the association of weight change with different nutrients and food groups after adjusting for age, smoking status, baseline body mass index, physical activity level, and total energy. RESULTS: Total energy was positively associated with weight gain and age was inversely associated with weight gain. None of the nutrients or food groups were significantly related to weight gain. CONCLUSIONS: These findings indicate that weight gain increased with increasing baseline total energy intake, particularly in the young. Future research is required to determine ways of decreasing energy intake in younger individuals.

Adult↗

PubMed1997

Is cigarette smoking an effect modifier of the relation between antihypertensive therapy and blood lipids?

We examined the relation between current use of antihypertensive medications and lipid levels in relation to smoking status. We used data from cross-sectional random sample surveys conducted between 1981 and 1993 in two southeastern New England communities. The analysis included 3,027 normotensive, 1,416 untreated hypertensive, and 1,174 treated hypertensive survey respondents between 40 and 64 years of age. After adjustment for body mass index, diabetes, mellitus, alcohol use, use of medications with adverse lipid effects, age, and sex, the estimated mean high-density-lipoprotein-cholesterol level among hypertensives using beta-blockers [44.6 mg per dl; 95% confidence interval (CI) = 43.1-46.1] was lower than that for either hypertensives (48.5 mg per dl; 95% CI = 47.8-49.2) or normotensives (47.1 mg per dl; 95% CI = 46.6-47.6). This pattern was similar among smokers and nonsmokers. Smokers treated with beta-blockers, however, had particularly low levels of high-density-lipoprotein-cholesterol (43.4 mg per dl; 95% CI = 40.7-46.1), compared with non-smokers using beta-blockers (45.8 mg per dl; 95% CI = 44.2-47.3). Low levels of high-density-lipoprotein-cholesterol may increase the risk of coronary heart disease among smokers using beta-blockers.

Adult↗

PubMed1996

Self-reported alcohol intake using two different question formats in southeastern New England.

BACKGROUND: Quantitative measures of alcohol intake are not always available in population studies. METHOD: The authors evaluated whether a question on alcohol intake embedded within a general health survey could be used as a surrogate marker for alcohol intake. We compared alcohol intake assessed with a food frequency questionnaire (FFQ) with alcohol intake assessed with a simple dichotomous survey question in a population-based sample. RESULTS: The study population consisted of 755 men and 1164 women from two communities in southeastern New England in the USA. There was strong agreement between the two alcohol questions for the classification of nondrinkers (98.1%). When participants were classified according to the quantity of alcohol consumed on the FFQ, the ability of the simple question to identify drinkers improved in a dose-response fashion. The Kappa statistic was 0.08 (P < 0.001), 0.38 (P < 0.001), and 0.81 (P < 0.001) for low, medium, and high consumers of alcohol, respectively. CONCLUSIONS: These results suggest that the survey alcohol question provides a useful qualitative measure of categorizing nondrinkers and identifying drinkers who consume more than one drink per day. In population studies where quantitative measures of alcohol intake may not be available a survey alcohol question may prove useful when alcohol intake is likely to confound results, and adjustment of the data is needed.

Adult↗

PubMed1996

High-density-lipoprotein cholesterol and types of alcoholic beverages consumed among men and women.

OBJECTIVES: Differences by sex in the relationship between high-density-lipoprotein (HDL) cholesterol and consumption of alcoholic beverages were examined in 1516 individuals. METHODS: Questionnaires and blood-sample data from cross-sectional surveys were analyzed. RESULTS: Both beer and liquor were independently associated with increased HDL cholesterol in the total group, in men, and in women after covariates were controlled for. Wine was associated with a significant increase in HDL cholesterol in women only. CONCLUSIONS: Among women and men, amount may be more important than type of alcoholic beverage consumed. The independent effect of wine on HDL cholesterol among men remains unclear since few men in this population consumed wine exclusively or in large quantities.

Adolescent↗