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Biomedical subjects

D S Main

Publications and source records attributed to D S Main.

At least 19 recordsLinked to original sources
PubMed1999

The family physician and house calls. A survey of Colorado family physicians.

BACKGROUND: Visiting patients at home has long been one of the activities of the family physician, but the practice of making house calls has diminished significantly during the second half of the 20th century. The goal of this study was to describe physicians' attitudes about house calls and their practice of making them in the rapidly changing health care environment of the United States. METHODS: A 30-item, self-administered questionnaire was designed to obtain demographic information about physicians and their attitudes toward house calls, practice experiences with making house calls, and any additional factors that influence making house calls. It was mailed to all members of the Colorado Academy of Family Physicians, during the summer of 1997. RESULTS: A 66% response rate was obtained from practicing physicians. Overall attitudes toward house calls were positive. Fifty-three percent of the respondents reported making house calls, and 8% reported making more than 2 house calls per month. Male physicians, those older than 40 years, those in rural settings, and those trained in a community-based residency were more likely to make house calls. Patient payer mix and practice setting were also related to whether a physician made house calls. House calls were most frequently made to geriatric patients, cancer patients, trauma patients, and patients with transportation difficulties. Many physicians reported using home health agencies for assessment and treatment of patients needing home care. CONCLUSIONS: Family physicians agree that house calls are good for patients. More than half of the respondents reported that they occasionally make house calls. However, few physicians routinely perform house calls.

Adult↗
PubMed1996

Toward optimal laboratory use. Problems in laboratory testing in primary care.

OBJECTIVE: To examine the frequency and characteristics of problems in laboratory testing in primary care physicians's offices and their impact on health care. DESIGN: Prospective descriptive study in which participating office-based primary care clinicians reported each occurrence of any laboratory incident during a 6-month study. Each identified problem was reported on a structured data collection instrument with an open-ended description of the problem. SETTING: Primary care physicians' offices in North America. PARTICIPANTS: One hundred twenty-four primary care clinicians in 49 practices of the Ambulatory Sentinel Practice Network (ASPN). MAIN RESULTS: A total of 180 problems were reported, yielding a crude rate of 1.1 problems per 1000 patient visits. Problems involving test ordering and specimen handling were the most common (56%), while those attributable to the test analysis itself accounted for 13% of the total. In the judgment of the practice staff, 27% of the reported problems had an impact on patient care. Of the 24 cases for which the specific impact was known and reported, half of the impacts were minor and about half were significant, as judged by whether or not the diagnosis and/or treatment of the patient was measurably affected. CONCLUSIONS: Clinically apparent problems with laboratory testing in primary care were found at a rate of 1.1 problems per 1000 patient visits. Of the laboratory problems that occurred in this study, 27% were judged by the physician to have an effect on patient care.

Clinical Laboratory Techniques↗
PubMed1996

Matching anonymous pre-posttests using subject-generated information.

Sensitive research issues call for anonymous questionnaires. This makes accurately matching pretests with posttests difficult or impossible. Various subject-generated coding schemes have been developed, but their accuracy has been unknown. This anonymous study, with 745 students, used subject-generated coding to match pretests with posttests. The matching was verified for accuracy with the use of a collateral, anonymous, sticker identification system. The coding system was able to accurately match 75.2% of all the pretest-posttest pairs. An additional 22.1% of the pairs were left unmatched and only 2.7% were matched incorrectly. Subject-generated coding systems can be very effective where confidentiality is important to protect.

Adolescent↗
PubMed1995

Human immunodeficiency virus seroprevalence in community-based primary care practices, 1990-1992. A report from the Ambulatory Sentinel Practice Network.

OBJECTIVE: To estimate the seroprevalence of human immunodeficiency virus type 1 (HIV-1) infection in primary care practices. METHODS: Fifty-four practices in the United States participated in an anonymous, unlinked HIV seroprevalence study between January 1990 and December 1992. Residual blood samples drawn for routine clinical tests from patients 15 to 49 years of age were centrally tested for the HIV-1 antibody for 1 month of each quarter. Information about patient demographics, clinician-recognized risk factors, the known HIV status of the patient, and whether the blood was drawn for HIV testing was recorded with each specimen. RESULTS: Of 21,998 specimens collected, 99 (0.45%) were seropositive. Of these 99 seropositive persons, 31.3% (a seroprevalence of 0.15%) were not suspected by their clinicians of being infected with HIV. Seroprevalences in men (0.96%) exceeded those in women (0.22%), and rates in rural practices (0.18%) were lower than in urban practices (0.71%). Among patients with unsuspected HIV infection, however, the gender differences, especially in rural areas, were less pronounced. Risk factors for HIV infection were infrequently noted. There was an increase in the overall seroprevalence during the 1990 to 1992 study period (0.36% to 0.53%); however, this trend was not statistically significant. CONCLUSIONS: Within a 3-year period, clinicians in at least two of five primary care practices can expect to encounter patients infected with HIV, regardless of practice location. Also, nearly one third of the patients with HIV infection will not be suspected of having this condition by their clinician.

Adolescent↗
PubMed1994

Preventing HIV infection among adolescents: evaluation of a school-based education program.

BACKGROUND: This article reports the results of the impact of a school-based HIV prevention intervention on students' knowledge, attitudes, and behavior related to HIV infection. METHODS: Seventeen schools within six Colorado school districts were assigned to either intervention or comparison conditions. Students in 10 schools received a 15-session, skills-based HIV prevention curriculum implemented by trained teachers. A total of 2,844 students completed at least one survey during the study period; surveys were matched using demographic questions, yielding a cohort of 979 students who had baseline and 6-month follow-up data. RESULTS: Intervention students exhibited greater knowledge about HIV and greater intent to engage in safer sexual practices than the comparison students. Among sexually active students at the 6-month follow-up, intervention students reported fewer sexual partners within the past 2 months, greater frequency of using condoms, and greater intentions to engage in sex less frequently and to use a condom when having sex. Intervention students were also more likely to believe that teens their age who engage in HIV risk behaviors are vulnerable to infection. The intervention neither delayed the onset nor decreased the frequency of sexual intercourse and the frequency of alcohol and other drug use before sex by the 6-month follow-up assessment. CONCLUSIONS: The results suggest that skills-based risk reduction programs can have an effect on student behavior. Among sexually active students, evidence suggests that school-based interventions can reduce behavior associated with risk of HIV infection.

Adolescent↗
PubMed1993

The role of primary care clinician attitudes, beliefs, and training in the diagnosis and treatment of depression. A report from the Ambulatory Sentinel Practice Network Inc.

OBJECTIVE: To examine the relation between primary care clinicians' attitudes, beliefs, and training and their perceptions of the importance and frequency of depression. DESIGN: A 56-item questionnaire was mailed to 226 clinicians in the Ambulatory Sentinel Practice Network Inc (ASPN), a primary care research network. SETTING: The ASPN, consisting of 69 primary care practices in the United States and Canada, cares for approximately 350,000 patients. MAIN OUTCOME MEASURE: The degree to which clinician training in depression and clinician attitudes and beliefs about treating depression predict their perceptions of the importance of depression in their primary care practices. RESULTS: Results of path analysis indicate that clinician training in depression, beliefs about the burden and discomfort associated with diagnosing and treating depression, perceptions of their patients' discomfort, and self-efficacy in diagnosing and treating depression are all significantly related to clinician perceptions of whether depression was an important and frequent primary care problem. Further analysis indicates that actual prevalence of depression accounted for little variability in clinicians' beliefs and attitudes about depression. CONCLUSIONS: What clinicians think their patients feel about issues on depression and how they view their own abilities may profoundly influence the degree to which they recognize depression in primary care. Understanding these factors may help explain and subsequently decrease clinician variability in the recognition of depression in primary care.

Attitude of Health Personnel↗
PubMed1993

Frequency of exercise and dropouts in a work-site program. Correlates of 6-month activity patterns.

Exercise professionals have little information concerning expected levels of exercise for new participants. This study examined the frequency of exercise of 949 employees during their first 6 months of membership in a work-site health promotion facility, using automated check-in data. Overall, the frequency of exercise declined, the proportion of frequent exercisers declined, and the proportion of employees who dropped out increased. Men exercised more frequently and were less likely to drop out than were women (P < .01). Younger employees exercised more frequently than did older employees. Employees in the middle salary level exercised more frequently than did employees in the lower or upper levels (P < .01). The employee groups that started out with a lower frequency of exercise remained at a lower frequency throughout the 6 months. By their 6th month, women were 50% more likely to drop out and 50% less likely to exercise regularly than were men. These figures provide a basis for comparison with other programs to document expected exercise behavior.

Adult↗
PubMed1993

Factors influencing mammogram ordering at the time of the office visit.

BACKGROUND: Breast cancer is the second most common cause of cancer death in women, with mammographic screening the only modality shown to decrease the death rate. However, only 17% to 41% of women have ever been screened, and multiple barriers to screening have been identified. This study examined physician and patient factors at a single encounter to explore components influencing mammography ordering. METHODS: Ten family physicians in a primary care research network completed daily data cards on encounters with women presenting for annual examinations, chronic problems, or breast-related complaints. Information collected included patient age, personal or family history of breast cancer, physician's perception of expected compliance, previous mammogram results, breast examination, physician's perception of need for a mammogram, whether the mammogram was ordered, and the patient's method of payment for the test. RESULTS: Eight hundred thirty-nine patients were entered into the study, and 277 mammograms were ordered. Mammograms were ordered for a greater percentage of patients with insurance (36%) than for those without insurance (26%) (P < .001). A multivariate analysis indicated that several factors helped to correctly classify 90% of mammogram ordering: the patient was making a first visit, a breast-related visit, or a visit for an annual examination; the patient had had a previous mammogram; had a breast examination at the current visit or within the past year; and the physician believed the patient would comply and believed that a mammogram was indicated. CONCLUSIONS: Factors unique to a physician-patient visit influence the physician with regard to ordering a mammogram, including the type of visit, whether the physician believes a mammogram is indicated, and the cost.

Adult↗
PubMed1992

Patients presenting to family physicians after a fall: a report from the Ambulatory Sentinel Practice Network.

BACKGROUND: Patients who fall present a diagnostic challenge to family physicians. The diagnostic workup of these patients must be thorough enough to detect and treat important causes of the fall yet not subject patients to unnecessary tests. Previous studies have provided only limited guidance for primary care physicians because in general they occurred in settings other than primary care and focused on a single age group. METHODS: The Ambulatory Sentinel Practice Network (ASPN) conducted a 6-month study of primary care patients of all ages presenting after a fall, or with medical problems resulting from a fall. ASPN clinicians collected information about the history, physical examination findings, and follow-up of these patients. Causes of falls were grouped into three categories: external reasons for falling, internal reasons related to gait, and internal reasons unrelated to gait. RESULTS: Participating clinicians identified 431 patients who had falls out of the 256,680 seen for any reason during the study period. The patients ranged in age from 1 to 94 years. The rate of falls for patients increased rapidly after age 65 years. Most falls occurred for reasons external to the patient, but internal reasons, both nonlocomotor and locomotor, increased after age 65 years. No nonlocomotor causes for a fall were found in patients younger than 65 years of age. Also, the rate of hospitalization of patients seen for falls was greater in the geriatric age group. CONCLUSIONS: The results highlight the need for further research about falls, particularly those occurring in pediatric and young adult patients. Furthermore, correcting environmental hazards and modifying gait problems in the elderly by increasing lower extremity and truncal strength could decrease the risk of falling.

Accidental Falls↗
PubMed1989

A subsidized perinatal care program in a rural Colorado county.

A large number of medically indigent women in rural areas currently receive little or no prenatal care, raising major concerns regarding perinatal health. In Colorado, subsidized prenatal and labor/delivery programs have been instituted to address this problem. This article describes the implementation of two programs in one rural county. In these rural programs, private physicians, health department personnel, and social work staff at the local hospital collaborate to provide financial assistance, comprehensive health education, and quality medical care for eligible pregnant women. The identified benefits and barriers unique to the provision of quality perinatal care in rural settings are discussed.

Colorado↗
PubMed1988

Children's preference for challenge: the role of perceived competence and control.

This research tested the hypothesis that children's perceptions of academic competence and their personal control over school-related performance affects subsequent intrinsic interest and preference for challenge in an evaluative setting. In a correlational study, children's self-reported perceptions of academic competence and personal control were found to relate positively to their intrinsic interest in schoolwork and preference for challenging school activities. A subset of this sample was exposed to varying levels of a controlling directive, and preference for challenge was assessed behaviorally during a free-choice period in which subjects were unaware that they were being observed. As predicted, the data indicated that when given the evaluative, controlling directive, children who had high perceptions of academic competence and control preferred a greater challenge than did children whose perceptions were low on these measures. No difference between groups in terms of preference for challenge was evident when no controlling directive was presented. These findings are discussed in terms of theories of intrinsic motivation and potential processes that underly these effects.

Achievement↗
PubMed1986

Enhancing interest in peer interaction: a developmental analysis.

Using an intrinsic motivation paradigm, the effects of providing different reasons for interacting with a peer were examined in terms of children's subsequent interest in playing with the other child. Children (5 1/2, 7, and 9 years old) were randomly assigned to 1 of 3 conditions and provided with identical information about a child presented on a television monitor (that he was nice and had a new Lego game). In the experimental conditions, children were then asked if they wanted to play with the peer either "because he has a new game" (situational information) or "because he's real nice" (dispositional information). The results indicated that, for the 9-year-olds, the dispositional/intrinsic information enhanced subsequent intrinsic interest in the peer relative to the control condition, while the situational information undermined later interest. In contrast, for the younger age groups, the situational information increased interest in peer interaction for the younger age groups in comparison to the control condition, while the dispositional information did not differ from control. The findings are discussed in terms of potential processes underlying these effects.

Child↗
PubMedDate not supplied

The inadequacy of using means to compare medical costs of smokers and nonsmokers.

The costs associated with health risks have become a primary focus in the field of health promotion. Unfortunately, the nature and quality of medical cost data are not ideal for simple comparisons of health risk groups. Most health promotion professionals have had little or no training on how to interpret cost data and are thus unaware of the limitations and problems inherent in cost comparisons. This report illustrates the problems encountered when using cost data, using examples from a medical claims dataset. Specifically, the potential errors that result from comparing group means are shown. A set of alternatives for practitioners and researchers to consider when comparing costs for different groups are offered.

Adolescent↗
PubMedDate not supplied

Comparing medical costs by analyzing high-cost cases.

Most of the medical care expenses paid by an entire company are generated by a small percentage of employees. The most expensive employee may have costs 100 to 500 times as much as the typical employee. Instead of comparing average costs, it makes sense to investigate whether employees with unhealthy behaviors are more prone to extreme costs. This article describes methods of comparing the costs of health risk groups by examining the proportion of high-cost employees in each group. The article illustrates the methods using a health claims dataset that compares male smokers, ex-smokers, and nonsmokers.

Adolescent↗
PubMedDate not supplied

Practice style differences between family physicians and internists.

BACKGROUND: Because an estimated 70 percent of all medical care expenditures are generated by physicians, evaluation of specialty practice styles is essential to learn what changes in policies governing physician training, service delivery, and patterns of medical practice would promote cost containment. METHODS: We examined the 1981 and 1985 National Ambulatory Medical Care Survey for seven primary care diagnoses to compare practice style differences between family physicians and internists and to look for changes in family physicians' practice styles between 1981 and 1985. RESULTS: Family physicians referred fewer patients in 1985 and spent 3 to 10.5 minutes less per patient encounter than internists. Clinical laboratory testing, electrocardiogram (ECG) ordering, and radiographic examinations differed significantly between the two groups in 1981 and 1985 for some diagnoses. In 1981, family physicians did Papanicolaou smears 2.2 times more often than internists during general medical examinations; however, in 1985, there was no difference. Between 1981 and 1985, family physicians ordered significantly more laboratory tests and ECGs for some diagnoses but had no change in the number of radiographs ordered or referrals. For six diagnoses, they spent more time with a patient encounter in 1985 than in 1981. CONCLUSIONS: Family physicians and internists appear to be more alike in practice style, but significant differences remain. These differences, as well as changing practice styles of family physicians, have implications for training and health care resource distribution.

Clinical Laboratory Techniques↗
PubMedDate not supplied

Measuring health: guidelines for reliability assessment.

In the area of health measurement, few guidelines exist for the health professional interested in understanding the concept of reliability. Yet, often there is a need to construct, modify, or select a reliable instrument that will satisfy a particular research or clinical need. This article reviews the concept of reliability and presents a few of the more common techniques used to calculate the reliability of health assessment instruments. Practical guidelines for questionnaire construction and administration are also discussed.

Data Collection↗
PubMedDate not supplied

The contraceptive implant and the injectable: a comparison of costs.

A comparison of the relative costs of the injectable contraceptive (depot medroxyprogesterone acetate) and the hormonal implant (Norplant) indicates that the implant is a less costly contraceptive option when it is used for its full five-year lifespan. Over a five-year period, the implant costs $107 annually, compared with $140 per year for the injectable. However, if a woman discontinues the implant before she has used it for at least four years, the injectable becomes the less costly option. Relatively high continuation rates--around 95% annually--are necessary to make the implant the more cost-effective contraceptive method.

Cost-Benefit Analysis↗