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Biomedical subjects

Somnath Saha

Publications and source records attributed to Somnath Saha.

At least 19 recordsLinked to original sources
PubMed2026

Association between prenatal exposure to tetrachloroethylene and adverse birth outcomes: Systematic review and meta-analysis.

BACKGROUND: Tetrachloroethylene (PCE) is a ubiquitous chlorinated solvent with documented placental transfer. Despite widespread environmental and occupational exposure, no prior systematic review has synthesized evidence on prenatal PCE exposure and adverse birth outcomes. METHODS: We conducted a systematic review and meta-analysis of observational studies. PubMed, Web of Science, PsycINFO, EMBASE, and CINAHL were searched from inception to July 13, 2026. Eligible studies reported associations between prenatal PCE exposure (drinking water or inhalation) and adverse birth outcomes. Study quality was assessed using the Newcastle-Ottawa Scale (NOS) and Agency for Healthcare Research and Quality (AHRQ) criteria. Random-effects meta-analyses were performed using risk ratios (RRs) with 95% confidence intervals (CIs), with Knapp-Hartung adjustments and Paule-Mandel τ2 estimation. RESULTS: Twenty one studies (1987-2023) met inclusion criteria. Prenatal PCE exposure was associated with spontaneous abortion (8 studies; RR = 1.28, 95% CI 1.00-1.63; I2 = 64.2%). Analyses of stillbirth, central nervous system defects, oral clefts, neural tube defects, preterm birth, low birthweight, and small-for-gestational-age (SGA) yielded positive but statistically non-significant pooled estimates. The certainty of evidence ranged from very low to low across outcomes (GRADE). CONCLUSIONS: Prenatal PCE exposure may be associated with spontaneous abortion, particularly at higher exposure levels, and with SGA. Findings support ongoing regulatory efforts to limit PCE in occupational and environmental settings, particularly for pregnant individuals. Future prospective studies with biological monitoring and confounder-adjusted designs are needed.

Tetrachloroethylene↗
PubMed2006

Methodological shortcomings predicted lower harm estimates in one of two sets of studies of clinical interventions.

OBJECTIVES: High quality harms data are necessary to appropriately assess the balance between benefits and harms of interventions. Little is known, however, about whether perceived methodological shortcomings are associated with lower estimates of harms. STUDY DESIGN AND SETTING: Studies reporting harms associated with carotid endarterectomy (CEA) and rofecoxib were identified using published systematic reviews. A standardized abstraction form, including eight predefined criteria for assessing the quality of harms reporting, was used to extract data. Univariate and multivariate analyses were performed to empirically evaluate the association between quality criteria and estimates of harms. RESULTS: In 111 studies of CEA, meeting five of the eight-quality criteria was associated with significantly higher adverse event rates. A quality-rating instrument with four criteria predicted adverse events (5.7% in studies rated "adequate," compared to 3.9% in studies rated "inadequate" [P=0.0003]). In multivariate analyses, the quality-rating assignment remained significant when controlling for other clinical and study-related variables. Different quality criteria, however, predicted estimates of risk for myocardial infarction in 16 trials of rofecoxib. CONCLUSION: The presence of methodological shortcomings can predict lower estimates of serious harms. Clinicians and researchers should consider methodological shortcomings when evaluating estimates of harms associated with clinical interventions.

Biomedical Research↗
PubMed2006

Losing culture on the way to competence: the use and misuse of culture in medical education.

Most cultural competence programs are based on traditional models of cross-cultural education that were motivated primarily by the desire to alleviate barriers to effective health care for immigrants, refugees, and others on the sociocultural margin. The main driver of renewed interest in cultural competence in the health professions has been the call to eliminate racial and ethnic disparities in the quality of health care. This mismatch between the motivation behind the design of cross-cultural education programs and the motivation behind their current application creates significant problems. First, in trying to define cultural boundaries or norms, programs may inadvertently reinforce racial and ethnic biases and stereotypes while doing little to clarify the actual complex sociocultural contexts in which patients live. Second, in attempting to address racial and ethnic disparities through cultural competence training, educators too often conflate these distinct concepts. To make this argument, the authors first discuss the relevance of culture to health and health care generally, and to disparities in particular. They then examine the concept of culture, paying particular attention to how it has been used (and misused) in cultural competence training. Finally, they discuss the implications of these ideas for health professions education.

Clinical Competence↗
PubMed2005

Challenges in systematic reviews of economic analyses.

Economic analyses can provide valuable information for health care decision makers. Systematic reviews of economic analyses can integrate information from multiple studies and provide important insights by systematically examining how differences between models lead to different results. We use our experience in developing and implementing systematic reviews of economic analyses for the U.S. Preventive Services T ask Force, particularly our systematic review of the cost-effectiveness of colorectal cancer screening, to illustrate key methodologic challenges and suggest a framework for other researchers in this area.

Colorectal Neoplasms↗
PubMed2005

Teaching systems-based practice to residents by using independent study projects.

The changing health care marketplace requires new graduates to be familiar with complex health systems. Since 1999 the Oregon Health & Science University internal medicine residency program has offered a seminar-based health systems curriculum, but residents lacked an opportunity to actively apply learned concepts. To achieve this goal, the authors developed a second curricular component, the Health Systems Independent Study Project (HSISP). The HSISP is a self-directed assessment of a health care system or delivery issue residents complete in their third year. The curriculum was implemented in 2001 with goals of gaining a focused understanding of a health systems concept and building related skills. Residents present their study projects to all curriculum participants. Topics addressed so far include adherence to coronary artery disease guidelines in a defined population, screening strategies for lung cancer, resident burnout, and many others. Residents have found that these projects enhance their systems knowledge, help them link systems-based-practice concepts to clinical practice, and foster opportunities for networking and early career development.

Curriculum↗
PubMed2004

Racial discrepancies in the association between paternal vs. maternal educational level and risk of low birthweight in Washington State.

BACKGROUND: The role of paternal factors in determining the risk of adverse pregnancy outcomes has received less attention than maternal factors. Similarly, the interaction between the effects of race and socioeconomic status (SES) on pregnancy outcomes is not well known. Our objective was to assess the relative importance of paternal vs. maternal education in relation to risk of low birth weight (LBW) across different racial groups. METHODS: We conducted a retrospective population-based cohort study using Washington state birth certificate data from 1992 to 1996 (n = 264,789). We assessed the associations between maternal or paternal education and LBW, adjusting for demographic variables, health services factors, and maternal behavioral and obstetrical factors. RESULTS: Paternal educational level was independently associated with LBW after adjustment for race, maternal education, demographic characteristics, health services factors; and other maternal factors. We found an interaction between the race and maternal education on risk of LBW. In whites, maternal education was independently associated with LBW. However, in the remainder of the sample, maternal education had a minimal effect on LBW. CONCLUSIONS: The degree of association between maternal education and LBW delivery was different in whites than in members of other racial groups. Paternal education was associated with LBW in both whites and non-whites. Further studies are needed to understand why maternal education may impact pregnancy outcomes differently depending on race and why paternal education may play a more important role than maternal education in some racial categories.

Journal Article↗
PubMed2004

Racial and ethnic differences in patient perceptions of bias and cultural competence in health care.

OBJECTIVES: To determine: 1) whether racial and ethnic differences exist in patients' perceptions of primary care provider (PCP) and general health care system-related bias and cultural competence; and 2) whether these differences are explained by patient demographics, source of care, or patient-provider communication variables. DESIGN: Cross-sectional telephone survey. SETTING: The Commonwealth Fund 2001 Health Care Quality Survey. SUBJECTS: A total of 6,299 white, African-American, Hispanic, and Asian adults. MEASUREMENTS AND MAIN RESULTS: Interviews were conducted using random-digit dialing; oversampling respondents from communities with high racial/ethnic minority concentrations; and yielding a 54.3% response rate. Main outcomes address respondents' perceptions of their PCPs' and health care system-related bias and cultural competence; adjusted probabilities (Pr) are reported for each ethnic group. Most racial/ethnic differences in perceptions of PCP bias and cultural competence were explained by demographics, source of care, and patient-physician communication variables. In contrast, racial/ethnic differences in patient perceptions of health care system-wide bias and cultural competence persisted even after controlling for confounders: African Americans, Hispanics, and Asians remained more likely than whites (P <.001) to perceive that: 1) they would have received better medical care if they belonged to a different race/ethnic group (Pr 0.13, Pr 0.08, Pr 0.08, and Pr 0.01, respectively); and 2) medical staff judged them unfairly or treated them with disrespect based on race/ethnicity (Pr 0.06, Pr 0.04, Pr 0.06, and Pr 0.01, respectively) and how well they speak English (Pr 0.09, Pr 0.06, Pr 0.06, and Pr 0.03, respectively). CONCLUSION: While demographics, source of care, and patient-physician communication explain most racial and ethnic differences in patient perceptions of PCP cultural competence, differences in perceptions of health care system-wide bias and cultural competence are not fully explained by such factors. Future research should include closer examination of the sources of cultural bias in the US medical system.

Adult↗
PubMed2004

The Latina paradox: an opportunity for restructuring prenatal care delivery.

Latina mothers in the United States enjoy surprisingly favorable birth outcomes despite their social disadvantages. This "Latina paradox" is particularly evident among Mexican-born women. The social and cultural factors that contribute to this paradox are maintained by community networks--informal systems of prenatal care that are composed of family, friends, community members, and lay health workers. This informal system confers protective factors that provide a behavioral context for healthy births. US-born Latinas are losing this protection, although it could be maintained with the support of community-based informal care systems. We recommend steps to harness the benefits of informal systems of prenatal care in Latino communities to meet the increasing needs of pregnant Latina women.

Acculturation↗
PubMed2004

Physician race and ethnicity, professional satisfaction, and work-related stress: results from the Physician Worklife Study.

There are limited data about minority physicians' professional satisfaction and job stress. In this study, we describe by race and ethnicity, satisfaction, and job stress among a national sample of physician. We analyzed data from 2,217 respondents to the Physicians' Worklife Survey (PWS), a career satisfaction survey of physicians drawn from the AMA Physician Masterfile. Scales measuring overall job and career satisfaction and work-related stress were constructed from Likert-response items. We examined the association between physician ethnicity and each of these scales. Respondents included 57 black, 134 Hispanic, 400 Asian or Pacific Islander, and 1,626 white physicians. In general, minority physicians appeared to serve a more demanding patient base than did white physicians. Hispanic physicians reported significantly higher job (p=0.05) and career (p=0.03) satisfaction compared to white physicians but no significant difference in stress. Asian or Pacific Islander physicians averaged lower job satisfaction (p=001) and higher stress (p<0.01) compared to white physicians. Black physicians did not differ significantly from white physicians on any of the three measures. Significant racial and ethnic variations were found with respect to several specific satisfaction domains: autonomy, patient care issues, relations with staff, relations with the community, pay, and resources.

Adult↗
PubMed2003

The cost-effectiveness of screening mammography beyond age 65 years: a systematic review for the U.S. Preventive Services Task Force.

PURPOSE: There are few data on the effects of disease biology and competing mortality on the effectiveness of screening women for breast cancer after age 65 years. The authors performed a review to determine the costs and benefits of mammography screening after age 65 years. DATA SOURCES: Cost-effectiveness articles published between January 1989 and March 2002. STUDY SELECTION: Studies were identified by using MEDLINE and the National Health Service Economic Evaluation Database. The authors included research on screening after age 65 years conducted from a societal or government perspective; reviews and analyses of other technologies were excluded. DATA SYNTHESIS: 115 studies were identified and 10 met inclusion criteria. One study modeled age-dependent assumptions of disease biology. No study fully captured the potential harms of screening, including anxiety associated with false-positive results, overdiagnosis, and previous knowledge of cancer or living longer with the consequences of treatment. Studies differed in the specific strategies compared and in analytic approaches. On average, extending biennial screening to age 75 or 80 years was estimated to cost 34 000 dollars to 88 000 dollars (2002 U.S. dollars) per life-year gained, compared with stopping screening at age 65 years. Two studies suggested that it was more cost-effective to target healthy women than those with several competing risks for death. CONCLUSIONS: Current estimates suggest that biennial breast cancer screening after age 65 years reduces mortality at reasonable costs for women without clinically significant comorbid conditions. More data are needed on disease biology and preferences for benefits and harms in older women.

Age Factors↗
PubMed2003

Patient-physician relationships and racial disparities in the quality of health care.

OBJECTIVES: This study explored whether racial differences in patient-physician relationships contribute to disparities in the quality of health care. METHODS: We analyzed data from The Commonwealth Fund's 2001 Health Care Quality Survey to determine whether racial differences in patients' satisfaction with health care and use of basic health services were explained by differences in quality of patient-physician interactions, physicians' cultural sensitivity, or patient-physician racial concordance. RESULTS: Both satisfaction with and use of health services were lower for Hispanics and Asians than for Blacks and Whites. Racial differences in the quality of patient-physician interactions helped explain the observed disparities in satisfaction, but not in the use of health services. CONCLUSIONS: Barriers in the patient-physician relationship contribute to racial disparities in the experience of health care.

Adult↗
PubMed2003

Impact factor: a valid measure of journal quality?

OBJECTIVES: Impact factor, an index based on the frequency with which a journal's articles are cited in scientific publications, is a putative marker of journal quality. However, empiric studies on impact factor's validity as an indicator of quality are lacking. The authors assessed the validity of impact factor as a measure of quality for general medical journals by testing its association with journal quality as rated by clinical practitioners and researchers. METHODS: We surveyed physicians specializing in internal medicine in the United States, randomly sampled from the American Medical Association's Physician Masterfile (practitioner group, n = 113) and from a list of graduates from a national postdoctoral training program in clinical and health services research (research group, n = 151). Respondents rated the quality of nine general medical journals, and we assessed the correlation between these ratings and the journals' impact factors. RESULTS: The correlation between impact factor and physicians' ratings of journal quality was strong (r2 = 0.82, P = 0.001). The correlation was higher for the research group (r2 = 0.83, P = 0.001) than for the practitioner group (r2 = 0.62, P = 0.01). CONCLUSIONS: Impact factor may be a reasonable indicator of quality for general medical journals.

Adult↗