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Biomedical subjects

Stephen Birch

Publications and source records attributed to Stephen Birch.

At least 37 records · Page 2Linked to original sources
PubMed2004

Who you know, where you live: social capital, neighbourhood and health.

This article examines the degree to which relationships between social capital and health are embedded in local geographical contexts and influenced by demographic factors, socio-economic status, health behaviours and coping skills. Using data from a telephone survey of a random sample of adults (N=1504 respondents, response rate=60%), the article determines if relationships between involvement in voluntary associations and various measures of individual health are associated with neighbourhood of residence in the mid-sized city of Hamilton, Canada. Associational involvement and overweight status (assessed by body-mass score) were weakly but significantly related after controlling for the other variables; involvement had relationships with self-rated health and emotional distress before but not after controlling for socio-economic status, health behaviours and coping skills. Relationships between neighbourhood of residence and two health outcomes, self-rated health and overweight status, were statistically significant before and after controlling for the other characteristics of respondents; neighbourhood of residence was not a significant predictor of number of chronic conditions and emotional distress in multivariate models. The neighbourhood and associational involvement relationships with health were not dependent upon one another, suggesting that neighbourhood of residence did not help to explain the positive health effects of this particular measure of social capital.

Adaptation, Psychological↗
PubMed2004

Portfolio theory and the alternative decision rule of cost-effectiveness analysis: theoretical and practical considerations.

Bridges and Terris (Soc. Sci. Med. (2004)) critique our paper on the alternative decision rule of economic evaluation in the presence of uncertainty and constrained resources within the context of a portfolio of health care programs (Sendi et al. Soc. Sci. Med. 57 (2003) 2207). They argue that by not adopting a formal portfolio theory approach we overlook the optimal solution. We show that these arguments stem from a fundamental misunderstanding of the alternative decision rule of economic evaluation. In particular, the portfolio theory approach advocated by Bridges and Terris is based on the same theoretical assumptions that the alternative decision rule set out to relax. Moreover, Bridges and Terris acknowledge that the proposed portfolio theory approach may not identify the optimal solution to resource allocation problems. Hence, it provides neither theoretical nor practical improvements to the proposed alternative decision rule.

Cost-Benefit Analysis↗
PubMed2004

The 'NICE' approach to technology assessment: an economics perspective.

The National Institute for Clinical Excellence has published guidelines for economic evaluations for considering whether new health care technologies contribute to the efficient use of National Health Service resources. The analytical basis of the guidelines is a comparison of the costs and consequences of new and existing methods for dealing with particular conditions using the incremental cost-effectiveness ratio (ICER). However, this fails to provide an explicit and systematic basis for addressing the dual objectives of health maximisation and equitable availability of technologies in the context of a fixed NHS budget. We show that information on the costs and consequences of a particular technology is insufficient to address issues of efficiency of resource use. In addition, information is required about the total resources available and the alternative uses of those resources. Moreover, because these factors are unlikely to be identical for all settings, it is unlikely that the efficiency of using resources to support a new technology will be the same for all settings, even if the cost and consequences of the technology are the same across settings. Instead of improving the health outcomes from NHS resources, we show that using NICE guidelines to inform decisions about new technologies may lead to increased resources allocated to new technology, increased local variations in the use of new technologies and concerns about the sustainability and affordability of public funding for new technologies.

Canada↗
PubMed2004

Addressing the realities [correction of realties] of health care in northern aboriginal communities through participatory action research.

To address concerns about disruptions in the continuity of health care delivered to residents in three remote aboriginal communities in northern Ontario, Canada, the local health authority initiated a study in collaboration with the department of Health Canada responsible for ensuring that aboriginal reserves receive mandatory health services, and an inter-disciplinary team of researchers from two universities. The study focussed on the delivery of oncology, diabetes and mental health care, specifically, as well as systems issues such as recruitment and retention of health human resources and financial costs. The paper discusses the procedures involved, the benefits derived and the challenges encountered in doing this as a community driven participatory action research project. It also summarizes the findings that led to community formulated policy and program recommendations.

Canada↗
PubMed2004

Clinical research on acupuncture. Part 1. What have reviews of the efficacy and safety of acupuncture told us so far?

UNLABELLED: OVERVIEW AND METHODS: This paper discusses those medical conditions in which clinical trials of acupuncture have been conducted, and where meta-analyses or systematic reviews have been published. It focuses on the general conclusions of these reviews by further examining official reviews conducted in the United States, United Kingdom, Europe, and Canada each of which examined available systematic reviews. While all reviews agree that the methodological rigor of acupuncture clinical trials has generally been poor and that higher quality clinical trials are necessary, this has not completely hampered the interpretation of the results of these clinical trials. In some conditions the evidence of efficacy has clearly reached a sufficient critical mass from enough well-designed studies to draw clear conclusions; for the rest, the evidence is difficult to clearly interpret. This paper also examines conclusions from the same international reviews on the safety and adverse effects of acupuncture. Here, conclusions are more easily drawn and there is good agreement about the safety of acupuncture. RESULTS AND CONCLUSIONS: General international agreement has emerged that acupuncture appears to be effective for postoperative dental pain, postoperative nausea and vomiting, and chemotherapy-related nausea and vomiting. For migraine, low-back pain, and temporomandibular disorders the results are considered positive by some and difficult to interpret by others. For a number of conditions such as fibromyalgia, osteoarthritis of the knee, and tennis elbow the evidence is considered promising, but more and better quality research is needed. For conditions such as chronic pain, neck pain, asthma, and drug addiction the evidence is considered inconclusive and difficult to interpret. For smoking cessation, tinnitus, and weight loss the evidence is usually regarded as negative. Reviews have concluded that while not free from serious adverse events, they are rare and that acupuncture is a relatively safe procedure.

Acupuncture Therapy↗
PubMed2004

Clinical research on acupuncture. Part 2. Controlled clinical trials, an overview of their methods.

There is almost universal agreement that the quality of clinical trials of acupuncture is poor. There is an urgent need to improve their quality. The author develops here a list of 45 criteria important in the design, implementation, and writing up of controlled clinical acupuncture trials. This list has been compiled after examining the quality assessment criteria used in meta-analyses and systematic reviews of acupuncture, general publications on clinical trial designs and methodological considerations specific to acupuncture trials. Each criterion is discussed with recommendations about use and implementation. Additionally, each criterion is discussed relative to their importance in three types of acupuncture trial, acupuncture versus sham acupuncture, acupuncture versus standard therapy and acupuncture versus no treatment or wait-list. It is hoped that this exploration and systematic presentation of the 45 criteria will contribute to improving the quality of clinical trials of acupuncture. Improved trial quality will lead to greater ease interpreting the results of trials, especially in systematic reviews.

Acupuncture Therapy↗
PubMed2004

The Diabetes Continuity of Care Scale: the development and initial evaluation of a questionnaire that measures continuity of care from the patient perspective.

The purpose of the present study was to develop and pilot test a questionnaire to assess continuity of care from the perspective of patients with diabetes. Seven patient and two healthcare-provider focus groups were conducted. These focus groups generated 777 potential items. This number was reduced to 56 items after item reduction, face validity testing and readability analysis, and to 47 items after a preliminary factor analysis. Readability was assessed as requiring 7-8 years of schooling. Sixty adult patients with diabetes completed the draft Diabetes Continuity of Care Scale (DCCS) at a single point in time to assess the validity of the instrument. Patients completed the draft DCCS again 2 weeks later to assess test-retest reliability. A provisional factor analysis and grouping according to clinical sense yielded five domains: access and getting care, care by doctor, care by other healthcare professionals, communication between healthcare professionals, and self-care. The internal consistency (Cronbach's alpha) for the whole scale was 0.89. The test-retest reliability was r = 0.73. The DCCS total score was moderately correlated with some of the measures used to establish construct validity. The DCCS could differentiate between patients who did and did not achieve specific process and clinical indicators of good diabetes care (e.g. Hba1c tested within 6 months). The development of the DCCS was centred on the patient's perspective and revealed that the patient perspective regarding continuity of care extends beyond the concept of seeing one doctor. Initial testing of this instrument demonstrates that it has promise as a reliable and valid measure in this area.

Consensus↗
PubMed2004

Utilities of dentin regeneration among insured and uninsured adults.

OBJECTIVES: This population-based study measured utilities (preferences measured under conditions of uncertainty) of dentin regeneration (DR), a potential new therapy, root canal therapy (RCT), and extraction (EXT). METHODS: A representative sample of dentate adults (aged 18-69 years) was randomly selected from the Detroit area. A computer program was used to administer the standard gamble (SG) method and record utility score (US) for treatment options of a tooth with reversible pulpitis using the SG method. For the SG method, two anchor states were used: filled tooth with full oral health and filled tooth with severe and continuous pain leading to EXT. Additional data were obtained using a self-administered questionnaire. RESULTS: Out of the 807 adults who resided in 446 screened and selected households, a final sample of 630 adults who resided in 368 households were interviewed. The mean US for DR with 75 and 95% success rates were 72.5 and 86.2 (on a 0-100 scale), respectively. The US for RCT and immediate EXT were 75.6 and 31.3, respectively. Eleven per cent of the adults valued DR with 95% success probability higher than a simple filling with full oral health for life. There were no statistically significant differences in the average US of DR between insured and uninsured adults. Factors such as gender, race, education, income and insurance status, experiences with EXTs or root canal treatment, regularity of dental visits, quality of life, and quality of oral health were not significantly associated with the scores of DR. There was, however, a small but significant interaction between race and dental insurance, and race and gender. CONCLUSION: This population-based study found that DR was highly preferred to other standard treatment options.

Adolescent↗
PubMed2004

Willingness to pay for dentin regeneration in a sample of dentate adults.

OBJECTIVES: Measurement of individuals' valuation of dental treatments is important in the evaluation of new technologies. In this paper the value of dentin regeneration, a new treatment for teeth with reversible pulpitis, is measured based on what individuals say they would be willing to pay to receive the treatment. METHODS: A total of 611 randomly selected dentate adults answered willingness to pay (WTP) and dental insurance questions. Detailed descriptions of the process and expected outcomes for dentin regeneration were presented to subjects as part of a larger study measuring preferences for different treatments. WTP was determined for two different levels of success for dentin regeneration. RESULTS: At a success rate of 95%, the mean WTP for dentin regeneration was $262.70 (noninsured) and $11.00 per month (insured subjects). For success rate of 75%, the corresponding values were $210.90 and $9.20 per month. Multivariate analyses were used to identify any significant relationships between WTP and a range of variables covering socio-demographic, socio-economic, dental experience and oral health status variables. The findings indicate that individuals' valuations of treatments involve substantial unexplained variation. About half of the noninsured subjects would pay for dentin regeneration if it cost $200 per tooth. CONCLUSIONS: The data on the WTP for dentin regeneration indicate that a substantial percentage of adults will pay for this new technology. This study provides for the first time an estimate of WTP for dentin regeneration among the population.

Adult↗
PubMed2004

Multilevel health promotion research: conceptual and analytical considerations.

Health promotion research is often conceptualized through the use of socioecological frameworks. This results in data or variables associated with multiple levels such as individual, community, and provincial. These data are nested, or clustered. In other words, multilevel health promotion research is based on the idea that community influences health, above and beyond one's individual characteristics or behaviours. These contextual effects can be analyzed rigorously using multilevel modelling (MLM), thus determining whether contextual effects are truly derived from context or are the result of residents' social profile. MLM also facilitates examination of cross-level interaction effects. The authors discuss conceptual and methodological issues related to multilevel research. While multilevel pathways to health outcomes have been suggested at the conceptual level, analytical techniques that produce only average overall effects fail to reveal the various other influences on health behaviour.

Data Interpretation, Statistical↗
PubMed2003

Geographic disparity in premature mortality in Ontario, 1992-1996.

BACKGROUND: Standardized mortality ratios are used to identify geographic areas with higher or lower mortality than expected. This article examines geographic disparity in premature mortality in Ontario, Canada, at three geographic levels of population and considers factors that may underlie variations in premature mortality across geographic areas. All-cause, sex and disease chapter specific premature mortality were analyzed at the regional, district and public health unit level to determine the extent of geographic variation. Standardized mortality ratios for persons aged 0-74 years were calculated to identify geographic areas with significantly higher or lower premature mortality than expected, using Ontario death rates as the basis for the calculation of expected deaths in the local population. Data are also presented from the household component of the 1996/97 National Population Health Survey and from the 1996 Statistics Canada Census. RESULTS: Results showed approximately 20% higher than expected all-cause premature mortality for males and females in the North region. However, disparity in all-cause premature mortality in Ontario was most pronounced at the public health unit level, ranging from 20% lower than expected to 30% higher than expected. Premature mortality disparities were largely influenced by neoplasms, circulatory diseases, injuries and poisoning, respiratory diseases and digestive diseases, which accounted for more than 80% of all premature deaths. Premature mortality disparities were also more pronounced for disease chapter specific mortality. CONCLUSION: Geographic disparities in premature mortality are clearly greater at the small area level. Geographic disparities in premature mortality undoubtedly reflect the underlying distribution of population health determinants such as health related behaviours, social, economic and environmental influences.

Journal Article↗
PubMed2003

Conservative versus aggressive follow up of mildly abnormal Pap smears: testing for process utility.

Economic evaluation generally limits outcome measurement to the valuation of health outcomes produced by interventions without considering the impact of processes on utility. We test for process utility by comparing utility measurements for alternative approaches to managing abnormal Pap smears in the context of a fixed outcome. The impact of health care interventions on individual well-being was not confined to health outcomes. Aggressive and conservative follow-up approaches were associated with statistically significant differences in utilities. We also found that relative preferences among different processes may depend on the particular circumstances or pathologies being considered.

California↗
PubMed2003

Economics and the evaluation of health care programmes: generalisability of methods and implications for generalisability of results.

Increasing attention is being given to identifying standardised methods of analysis for the economic evaluation of health care programmes and generating generalisable findings from these methods. In this paper, we show how these approaches fail to reflect the social science foundations of the economics discipline and the economic theory of individual behaviour. Using simple examples, we show that the technical efficiency of a particular programme differs between communities, even though the underlying technology is the same for the communities. Similarly, the subjective considerations represented by the utility function are not generally transferable between settings or between individuals within settings. As a result, the efficiency of an intervention will be influenced by the context in which the intervention is experienced, even in the presence of identical production and utility functions. The lack of generalisability includes the validity of the methods used to analyse the subjective component of the evaluation exercise. The adoption of standardised methods of measurement and analysis, together with the use of findings from the application of these methods in other settings, might ease the administrative burden presented in resource allocation exercises. However, these approaches do not accommodate the intellectual substance of the wide range of problems and circumstances that underlie these exercises.

Attitude to Health↗
PubMed2003

Valuing the benefits and costs of health care programmes: where's the 'extra' in extra-welfarism?

The application of Sen's notion of capabilities to problems of the allocation of resources to health in the form of an extra-welfarist framework underlies the justification of quality adjusted life years (QALYs) as the method for valuing the benefits of health care. In this paper we critically appraise this application from both conceptual and empirical perspectives. We show that the alleged limitations of the welfarist approach are essentially limitations in its application, not in the capacity of the approach to accommodate the concerns of extra-welfarists. Moreover, the arguments used to justify the application of the extra-welfarist framework are essentially welfarist. We demonstrate that the methods used to measure QALYs share their basic theoretical roots with welfarist valuation methods, such as willingness to pay (WTP). Although QALYs and WTP share many challenges, we argue that WTP provides a method which performs better with respect to those challenges. In the context of evaluating alternative allocations of health care resources we are left asking what is 'extra' in extra-welfarism?

Cost-Benefit Analysis↗
PubMed2003

Optimizing a portfolio of health care programs in the presence of uncertainty and constrained resources.

Much research has been devoted to handling uncertainty in cost-effectiveness analysis. The current literature suggests summarizing uncertainty in cost-effectiveness analysis using acceptability curves or net health benefits. These approaches, however, focus only on uncertainty associated with costs and effects of the programs under consideration. In the real world, most decision-makers have to fund a portfolio of health care programs. Therefore, a more comprehensive approach would include in the analysis the uncertainty of costs and effects of all programs supported by the fixed budget. This paper extends the decision rule described by Birch and Gafni (J. Health Econ. 11(3) (1992) 279) within the context of a portfolio of programs when costs and effects are uncertain and resources constrained.

Budgets↗