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At least 433 records · Page 24Linked to original sources
PubMed2001

An 'other-race' effect in age estimation from faces.

Previous studies have shown that, in person-recognition tasks, people perform better for faces belonging to their own race than for those belonging to another race. Recently, however, this 'other-race' effect has also been found in a sex-discrimination task (O'Toole et al, 1996 Perception 25 669-676). In the present study, we investigated whether this finding extends to age perception. Caucasian and African participants were asked to estimate the age of Caucasian and African faces. The main result of this experiment was a significant 'race of subject' x 'race of face' interaction showing that Caucasian participants performed better at evaluating Caucasian faces than African faces. However, African participants performed equally with both type of faces. This result is explained by the Africans' time of residence in Belgium. The implication of this 'other-race' effect for age estimation is discussed with respect to eyewitness reports.

Adult↗
PubMed2000

The multiple-race population of the United States: issues and estimates.

This paper presents national estimates of the population likely to identify with more than one race in the 2000 census as a result of a new federal policy allowing multiple racial identification. A large number of race-based public policies-including affirmative action and the redistricting provisions of the Voting Rights Act-may be affected by the shift of some 8-18 million people out of traditional single-race statistical groups. The declines in single-race populations resulting from the new classification procedure are likely to be greater in magnitude than the net undercount in the U.S. census at the center of the controversy over using census sampling. Based on ancestry data in the 1990 census and experimental survey results from the 1995 Current Population Survey, we estimate that 3. 1-6.6% of the U.S. population is likely to mark multiple races. Our results are substantially higher than those suggested by previous research and have implications for the coding, reporting, and use of multiple response racial data by government and researchers. The change in racial classification may pose new conundrums for the implementation of race-based public policies, which have faced increasing criticism in recent years.

Censuses↗
PubMed1979

Race-specific molecules that protect soybeans from Phytophthora megasperma var. sojae.

Phytophthora megasperma var. sojae (A. A. Hildebrand) is a fungal stem and root rot-causing pathogen of soybeans. Glycoproteins secreted into the medium of the aseptically cultured fungus have been partially purified by (NH(4))(2)SO(4) precipitation and by column chromatography on norleucine-substituted Sepharose 4B and on DEAE-cellulose. Glycoprotein preparations from P. megasperma var. sojae races 1, 2, and 3 have been tested on four cultivars of soybeans. The partially purified glycoproteins from incompatible races of the pathogen (races that cannot successfully infect the plant), but not those from compatible races (races that can kill the plant), protect soybean seedlings from attack by compatible races. The seedlings are protected by introducing the glycoproteins into hypocotyl wounds of seedlings either 90 min prior to or at the time of inoculation of the wounds with mycelia of one of the pathogens. The glycoprotein preparations are poor nonspecific elicitors of phytoalexin accumulation; the glycoproteins have less than 1.0% of the elicitor activity of the glucans present in the mycelial walls of the pathogen.

Journal Article↗
PubMed1996

Use of the terms 'race', 'ethnicity', and 'national origins': a review of articles in the American Journal of Public Health, 1980-1989.

OBJECTIVES: To assess the use of the categories of race, ethnicity, and national origin in recent public health research. METHODS: We reviewed all research articles on human populations published in the American Journal of Public Health from January 1980 through December 1989. Articles were classified by (1) mention of the categories, (2) use of the categories, (3) presence of explicit definitions, and (4) definitional criteria. RESULTS: Specific categories (e.g. 'black', 'Chinese', 'Hispanic') or generic categories (e.g. 'race', 'ethnicity', 'national origin') were mentioned in 461 (50.4%) of 914 articles on human populations. In most studies (65.1%), single categories (e.g. race or ethnicity) were considered; in 1.3% of studies, two terms (e.g. both race and ethnicity) were examined independently; in 1.3%, categories were used interchangeably; in 5.6% of the studies, combined categories (e.g. race-ethnicity) were used; and in 27.5% of the studies, specific population groups were named without reference to a generic category. Explicit definitions of categories were present in only 8.4% of the articles in which the categories were considered. Absence of explicit definitions and use of combined and interchangeable categories suggest a lack of clarity and conceptual consistency in research on race, ethnicity, and national origin-related topics. CONCLUSION: To improve our assessment of differences in health status among racial, ethnic, and national origin groups, research involving these categories should assess their validity and should define concepts clearly, explicitly, and consistently. Such research would minimize misclassification, improve the interpretation of findings, facilitate comparison among studies, and enhance the understanding of causes underlying differences in health status among populations of different racial, ethnic, and national origins.

Ethnicity↗
PubMed2005

The influence of gender, race, and menthol content on tobacco exposure measures.

Research has suggested that race, gender, and menthol cigarette use influence tobacco-smoke exposure measures and smoking-related disease risk. For example, a high proportion of Black smokers prefer menthol cigarettes and, despite smoking fewer cigarettes per day (CPD) than do Whites, tend to have higher cotinine levels. Additionally, Black males are more at risk for smoking-related lung cancer. High cotinine levels and smoking menthol cigarettes may lead to higher toxin intake, which contributes to increased disease risk. We explored the relationship between tobacco exposure variables (i.e., cotinine, CPD, carbon monoxide [CO], nicotine content, and nicotine dependence) with respect to race, gender, and menthol content in a sample of 307 smokers recruited from the greater Boston area to participate in a smoking cessation treatment trial. The pattern of correlations between tobacco exposure measures and cotinine showed a consistently positive correlation between cotinine and CO in all smokers and a correlation between cotinine and CPD in those who smoked nonmenthol cigarettes. Cotinine and CPD correlations varied by gender and race among menthol cigarette smokers. Consistently, we found a significant gender x race x menthol interaction on salivary cotinine level as well as cotinine/CPD ratio. These findings suggest that the relationship between number of cigarettes consumed and salivary cotinine is more complex than previously believed. It is not sufficient to look at race alone; researchers and clinicians need to look at race and gender concurrently, as well as type of cigarette consumed.

Adult↗
PubMed2004

Reliability of power output during rowing changes with ergometer type and race distance.

Coaches, sport scientists and researchers assess rowing performance on-water and on a variety of ergometers. Ergometers are frequently used because of the easier assessment environment. However, there is limited information on the ability of rowers to reproduce mean power or time-trial time when using different rowing ergometers (Concept II and RowPerfect) or completing tests over different distances (500 m versus 2000 m races). To test the efficacy of an intervention on a rower's ability to produce power, or to monitor that ability, it is essential to determine a reliable rowing performance test. The per cent standard error of measurement in performance (assessed by mean power and time-trial time) of fifteen national standard rowers was determined for five repeated 500 m and two repeated 2000 m races on a Concept II and RowPerfect ergometer. The per cent standard error of measurement (% SEM) in mean power between 5x500m races, regardless of gender, was 2.8% (95% confidence limits (CL)=2.3 to 3.4%) for the Concept II ergometer and 3.3% (95% CL=2.5 to 3.9%) for the RowPerfect ergometer (n = 15). Over 2000 m the per cent standard error of measurement in mean power was 1.3% (95% CL 0.9 to 2.9%) for the Concept II ergometer and 3.3% (95% CL 2.2 to 7.0%) for the RowPerfect ergometer The results highlight an increase in per cent standard error of the mean during performance races of less than 2000m on the Concept II ergometer, and performance races on the RowPerfect ergometer compared with the Concept II ergometer over 500 m and 2000 m. The most appropriate protocol for testing the influence of an intervention on the ability of a rower to produce power would be 2000 m races on a Concept II ergometer.

Adult↗
PubMed2005

Modifications of serum and cellular parameters in trotters after a race. Macrophage migration inhibitory activity reduction and serum beta-glucan elevation.

Trotters are exposed to a chronic prolonged stress, such as daily training and frequent races during their active lifespans. There is evidence that trotters undergo very often lethal lung infections after a race, and therefore, is likely that modifications of certain physiologic cellular parameters could account for the increased susceptibility to microbial diseases. Here, we demonstrate that in 7 trotters after a race either serum values (e.g., glycaemia, triglycerides, transaminases, gamma-glutamyltransferase, cholinesterase, amylase, alkaline phosphatase, total proteins, serum albumin, sodium, blood urea nitrogen, lactic dehydrogenase, creatine phosphokinase, and creatinine) or hematological parameters (red blood cell count, hemoglobin, lymphocyte and monocyte count) were increased. At the same time, in the same animals after a race, macrophage migration inhibitory factor activity was depressed, thus indicating an impaired T-lymphocyte response. Finally, increased levels of circulating beta-glucans in some horses, after a race, may suggest a reduced clearance of fungal cell wall components. Taken together, these findings indicate a condition of multiple organ dysfunction, such as the liver, the kidney, the pancreas, and skeletal muscles, as well as a reduced cell-mediated immune response in trotters, after a race.

Animals↗
PubMed2002

Race, socioeconomic status, and perceived discrimination among healthy women.

OBJECTIVES: Perceived discrimination and socioeconomic status (SES) have been found to be related to health problems. However, little is known about how SES and ethnicity relate to perception and responses to discrimination. This study examined the relationship between race and a set of SES indicators, perceived discrimination (race and gender), and responses to perceived discrimination among healthy women. METHODS: The sample consisted of 460 women between the ages of 18 and 39 (194 black and 266 white). The independent variables included income, education, occupation, and race. The dependent variables included perceived discrimination (race/color and gender) and responses to unfair treatment. RESULTS: Income and education were both directly related to perceived racial discrimination. However, the relationship between education and perceived discrimination was modified by race. For white women, only higher education was related to less perceived discrimination, and there was no significant difference across education levels for black women. Education was the only variable significantly associated with perceived gender discrimination (more highly educated women reported more discrimination). Occupation and race were both related to responses to perceived discrimination. Black women were significantly less likely to talk to someone when treated unfairly than white women (OR = 0.37, 95% confidence interval [CI] = 0.191, 0.716), and women in managerial/professional positions were significantly more likely to do something about being treated unfairly than women in service occupations (OR = 4.76, CI = 2.14, 10.61). CONCLUSIONS: Our results suggest that both SES and race play important roles in women's perceptions of and responses to perceived discrimination.

Adolescent↗
PubMed2004

Four-year review of the use of race and ethnicity in epidemiologic and public health research.

To determine how current researchers address the use of race and ethnicity as variables in epidemiologic and public health studies, the authors conducted a comprehensive review of 1,198 articles published in the American Journal of Epidemiology and the American Journal of Public Health from 1996 to 1999. Seventy-seven percent (n = 919) of the articles referred to race or ethnicity. The number of variable categories ranged from 0 to 24, with an average of 3.14 per article. An enormous diversity of terms was used to describe the concepts of race and ethnicity as variables as well as to describe the categories used to assess these variables. Researchers frequently failed to differentiate between the concepts of race and ethnicity, to state the context in which these variables were used, to state the study methods used to assess these variables, and to discuss significant study results based on race or ethnicity. Continued professional commitment is needed to ensure the scientific integrity of race and ethnicity as variables. At a minimum, researchers should clearly state the context in which these valuable epidemiologic and public health study variables are being used, describe the method used to assess and categorize these variables, and discuss all significant findings.

Bibliometrics↗
PubMed2003

Evidence for inversion polymorphism related to sympatric host race formation in the apple maggot fly, Rhagoletis pomonella.

Evidence suggests that the apple maggot, Rhagoletis pomonella (Diptera: Tephritidae) is undergoing sympatric speciation (i.e., divergence without geographic isolation) in the process of shifting and adapting to a new host plant. Prior to the introduction of cultivated apples (Malus pumila) in North America, R. pomonella infested the fruit of native hawthorns (Crataegus spp.). However, sometime in the mid-1800s the fly formed a sympatric race on apple. The recently derived apple-infesting race shows consistent allele frequency differences from the hawthorn host race for six allozyme loci mapping to three different chromosomes. Alleles at all six of these allozymes correlate with the timing of adult eclosion, an event dependent on the duration of the overwintering pupal diapause. This timing difference differentially adapts the univoltine fly races to an approximately 3- to 4-week difference in the peak fruiting times of apple and hawthorn trees, partially reproductively isolating the host races. Here, we report finding substantial gametic disequilibrium among allozyme and complementary DNA (cDNA) markers encompassing the three chromosomal regions differentiating apple and hawthorn flies. The regions of disequilibrium extend well beyond the previously characterized six allozyme loci, covering substantial portions of chromosomes 1, 2, and 3 (haploid n = 6 in R. pomonella). Moreover, significant recombination heterogeneity and variation in gene order were observed among single-pair crosses for each of the three genomic regions, implying the existence of inversion polymorphism. We therefore have evidence that genes affecting diapause traits involved in host race formation reside within large complexes of rearranged genes. We explore whether these genomic regions (inversions) constitute coadapted gene complexes and discuss the implications of our findings for sympatric speciation in Rhagoletis.

Adaptation, Physiological↗
PubMed2001

Social networks among blacks and whites: the interaction between race and age.

OBJECTIVES: This study examined the main and interactive effects of age and race on the core characteristics of social networks including size, frequency of contact, geographical proximity, and composition of network. METHODS: Respondents were drawn from a stratified probability sample of people aged 20-93 in the greater Detroit metropolitan area. Approximately 30% of the sample were African American, and people aged 60 and older were over-sampled (n = 1.382). The authors used hierarchical regression analysis to estimate the influence of race and age on each component of social network, controlling for marital status, gender, and education. An interaction term (Race x Age) was added to explore the extent to which age moderates any detected race differences. RESULTS: Older age was associated with smaller, less frequently seen, and less proximal networks that had a higher proportion of kin. Blacks and Whites were similar with regard to proximity, but Blacks had smaller networks, more contact with network members, and more family members in their networks. Race differences in frequency of contact and proportion of kin were moderated by age, such that the differences in these variables diminished with increasing age. DISCUSSION: A systematic analysis of how age, race, and their interaction influence the characteristics of social networks furnishes important empirical knowledge about social networks among diverse groups. Such data may provide a context for how, and some explanation for why, support exchanges occur.

Adolescent↗
PubMed1998

Relaying the message of safer sex: condom races for community-based skills training.

This paper describes a community-based HIV prevention program designed to improve confidence in condom use skills by giving community members 'hands-on' experience in using condoms correctly. A condom race activity which had been effective in increasing condom skills confidence among university students in the US was modified and implemented with the general population in rural Northeast Thailand. In addition to providing training in condom use skills, the condom race was part of an integrated condom promotion and distribution campaign which responded to needs identified by the community, built upon the credibility and influence of local leaders and peers, and extended access to condoms into rural communities. Local leaders who had participated in a training-of-trainers program organized condom races in their communities, serving as positive role models for community acceptance of condom use. The condom race stimulated community discussion about condoms and increased participants' feelings of self-efficacy in correct condom use. Participation in the condom race activity was particularly empowering to women, who reported increased confidence in their ability to use condoms and to suggest using condoms with their partners after the race.

Adolescent↗
PubMed1993

Age-race interaction in prostatic adenocarcinoma treated with external beam irradiation.

The most important predictors of long-term survival in patients with adenocarcinoma of the prostate are histological grade and stage of disease. However, the role of other epidemiological factors, particularly age and race, remains controversial. There is a school of thought that black patients and younger patients have a biologically more aggressive disease. We analyzed the survival of 914 patients (867 whites and 47 blacks) with localized adenocarcinoma of the prostate treated with external beam irradiation from the Connecticut SEER Tumor Registry data base. Patients were treated from 1973-1987, and those with Stages A1, A2 and D2 were excluded. Patients < or = 60 years of age had a 5-year survival rate of 72% compared to 61% for those > 60 years of age (p = 0.06). When stratified by race, white patients had a 63% 5-year survival rate versus 47% in black patients (p = 0.02). When analyzed by race and age, and age-race interaction was noted. Although younger whites fared better than older whites, 77% versus 61% survival at 5 years (p = 0.02), younger blacks fared worse than older blacks, 31% versus 52% survival at 5 years (p = 0.21). Blacks, on average, presented at an earlier age than whites, 65 years versus 69 years (p = 0.001). Both races had similar stage and similar grade of disease. In older patients, both races presented with similar stage and grade of disease and had similar survival. However, in the younger age group, black patients presented with similar grade, but higher stage disease than whites. This may explain the worse survival in young blacks compared to young whites, 31% versus 77% at 5 years (p = 0.007). Multivariate analysis revealed that, even controlling for stage and grade, blacks still fared worse than whites. Increased age was associated with decreased survival in whites but increased survival in blacks.

Adenocarcinoma↗
PubMed2000

Impact of race on the outcome of carotid endarterectomy: a population-based analysis of 9,842 recent elective procedures.

OBJECTIVE: To examine the influence of race and other potentially confounding variables on the outcome of carotid endarterectomy (CEA). SUMMARY: Previous studies have demonstrated that CEA is performed less frequently in black patients, although little attention has been focused on the influence of race on the outcome of surgery. METHODS: The Maryland Health Services Cost Review Commission database was reviewed to identify all elective CEA procedures performed in all nonfederal acute care hospitals in the state from 1990 through 1995 to examine the influence of race and other factors on the rates of in-hospital complications, in-hospital stroke, length of stay, and total hospital charges. RESULTS: Carotid endarterectomy was performed in 9,219 (94%) white and 623 (6%) black patients during this period. The in-hospital stroke rate was 1.7%-3. 1% among black patients and 1.6% among white patients. Black patients had a longer length of stay and higher mean hospital charges than white patients. Multivariate logistic regression analysis identified black race as an independent risk factor for in-hospital stroke. Performance of CEA by a high-volume surgeon was protective for the combined occurrence of in-hospital stroke or death, and whites were more than twice as likely to undergo surgery performed by high-volume surgeons. Conversely, undergoing surgery in a low-volume hospital was associated with in-hospital stroke, and blacks were four times as likely to use low-volume hospitals. CONCLUSIONS: Black patients who underwent elective CEA in Maryland from 1990 to 1995 had an increased incidence of in-hospital stroke, a longer hospital stay, and higher hospital charges than whites. Black race was identified as an independent risk factor for in-hospital stroke, although the reasons for this influence of race on outcome are undefined. The authors' observations also suggest the possibility of limited access to optimal surgical care among blacks, and this issue warrants further study.

Black or African American↗
PubMedDate not supplied

Race and productivity outcome after traumatic brain injury: influence of confounding factors.

OBJECTIVE: Investigate the impact of race on productivity outcome after traumatic brain injury (TBI) and evaluate the influence of confounding factors on this relationship. DESIGN: Inception cohort of 1083 adults with TBI for whom 1-year productivity follow-up data were available. RESULTS: Univariable logistic regression indicated that race was a significant predictor of productivity outcome after TBI. African Americans were 2.76 times more likely to be nonproductive than whites and other racial minorities were 1.92 times more likely to be nonproductive than whites. Multivariable logistic regression analyses revealed that the effect of race on employability was influenced by confounds with preinjury productivity, education level, and cause of injury. After adjustment for other predictors, African Americans were 2.00 times more likely to be nonproductive than whites and other racial minorities were 2.08 times more likely to be nonproductive than whites. The multivariable logistic regression model with all predictors except race accounted for 39% of the variability in productivity outcome (R2-Nagelkerke=0.39), whereas the full logistic regression model including race accounted for 41% of the variability in productivity outcome (R2-Nagelkerke=0.41); a difference of only 2%. CONCLUSION: Any effect of race on productivity is significantly influenced by confounding with preinjury productivity, education level, and cause of injury.

Adult↗
PubMed1997

Could women outrun men in ultramarathon races?

To test a hypothesis that the differences in running performances between men and women narrow with increasing race distance, recent best running speeds (m.s-1) of 28 female ultramarathon runners over racing distances from 5 to 90 km were compared with those of male runners matched for 56 km race time, age and training. These comparisons revealed that the men ran faster than the women over 5 to 42.2 km (P < 0.01-0.05), but not in a 90-km race (2.82 +/- 0.04 vs 2.90 +/- 0.09 m.s-1). Declines in the men's and women's running speeds with increasing race distances were best fitted by Y = 2.9.exp.(-0.01.X) + 1.7 and Y = 2.1.exp.(-0.01.X) + 2.0 equations (r = -0.99). Differences between the exponential declines in the men's and women's running speeds over longer race distances were best fitted by a linear Y = -0.006 (X-66) equation (r = -0.98, P < 0.001). The negative slope and the X-axis intercept of this equation at 66 km supports the hypothesis that women ultramarathon runners have greater fatigue resistance than do equally trained men whose performances are superior up to the marathon distance.

Adult↗
PubMedDate not supplied

"Race" and the difficulties of language.

"Race," a construct created by scientists, is deeply ingrained in everyday discourses. Using postmodern theories to help us think through the complexities of language in relation to race, we come to understand that truths about race are changing, contingent, and contested products of cultural construction. It is impossible to understand or represent race as an object of study such that it can be known, yet untouched, by language. Health effects are one important consequence of race, particularly related to quality, access, marginalization, and privilege. Analyzing the effects of race bring it visibly into being, and makes evident how language shapes our understandings of the world and its human inhabitants.

Feminism↗
PubMed2003

Change in serum sodium concentration during a cold weather ultradistance race.

OBJECTIVE: To investigate change in serum sodium concentration and its potential causes during a cold weather ultradistance race. DESIGN: Descriptive research. SETTING: A 100-mile (161-km) race over a snow-packed course in the Alaskan wilderness. Athletes competed in 1 of 3 divisions: foot, bike, or ski. PARTICIPANTS: Twenty athletes (11 runners, 6 cyclists, 3 skiers) volunteered for the study. INTERVENTIONS: None. MAIN OUTCOME MEASURES: Subjects were weighed and had blood drawn for hematocrit, serum sodium, serum aldosterone, and plasma arginine vasopressin concentrations pre- and postrace. Fluid and sodium intake were determined by race dietary analysis. RESULTS: Serum sodium concentration decreased significantly prerace (140.8 +/- 1.2 mmol/L) to postrace (138.4 +/- 2.2 mmol/L), although no athletes were classified as hyponatremic. Mean weight loss was significant during the race (-1.2 kg), although 1 athlete maintained his weight, and 3 athletes gained small amounts of weight (0.2 kg, 0.2 kg, and 0.5 kg, respectively). Hematocrit decreased significantly prerace (42.2 +/- 3.5) to postrace (40.3 +/- 4.1). Plasma arginine vasopressin and serum aldosterone increased significantly during the race (2.6 +/- 0.7 to 6.0 +/- 4.6 pg/mL and 5.1 +/- 2.6 to 40.8 +/- 25.1 ng/dL, respectively). Fluid consumption was 300 +/- 100 mL/h, and sodium intake was 310 +/- 187 mg/h. CONCLUSIONS: Decreased serum sodium concentration after a cold weather ultradistance race was due to fluid overload caused by excessive fluid consumption. Current recommendations that ultradistance athletes consume 500 to 1000 mL/h may be too high for athletes competing in the extreme cold.

Adaptation, Physiological↗