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Biomedical subjects

Matthew M Davis

Publications and source records attributed to Matthew M Davis.

At least 55 records · Page 3Linked to original sources
PubMed2004

National availability of influenza vaccine among medical subspecialty practices.

BACKGROUND: Influenza vaccination rates fall short of national goals, particularly among individuals whose chronic conditions predispose them to complications of influenza. Availability of influenza vaccine in medical subspecialists' practices may affect vaccination rates among adults with chronic illness. METHODS: The practice sites of a national random sample of medical cardiology, endocrinology, and pulmonology physicians were contacted by telephone in February 2003 to March 2003 to determine which of them had influenza vaccine available to their patients during the 2002-2003 influenza season. The number of physicians in the practice and geographic location were also obtained. RESULTS: Office staff at the practices of 1683 of 2013 eligible physicians were successfully contacted, and 1473 provided information about vaccine availability. Overall, 1094 (74%) of practices had influenza vaccine available during the 2002-2003 season. Availability differed significantly by subspecialty: 54% cardiology, 78% endocrinology, and 90% pulmonology (p<0.001). Influenza vaccine was more often available at subspecialists' practices in the Northeast (80%) than in the South (74%), Midwest (71%), and West (70%; p<0.005). In multivariate analyses, pulmonology practices in all census regions and sizes were significantly more likely to have influenza vaccine available than was the reference cardiology practice. Several endocrinology practice types also had significantly higher influenza vaccine availability than those in cardiology practice, particularly in multi-physician practices. CONCLUSIONS: Influenza vaccine availability varies widely across practices in the three medical subspecialties that provide care to the largest numbers of individuals with an indication for the vaccine in the United States. These findings have implications for the accessibility of influenza vaccine to individuals at high risk for morbidity and mortality associated with influenza.

Chi-Square Distribution↗
PubMed2004

Emergency department use among Michigan children with special health care needs: an introductory study.

OBJECTIVE: To describe patterns of emergency department (ED) use among children dual-enrolled in Medicaid and Michigan's Children's Special Health Care Services (CSHCS). DATA SOURCES: Individual claims and enrollment data from Michigan's Medicaid and CSHCS programs for the period January 1, 1998, to June 30, 1999. Claims data were linked with eligibility data and then used to develop a 100 percent sample of claims for individuals enrolled in both Medicaid and CSHCS. STUDY DESIGN: Poisson regression analysis was used to examine the rate of ED use for dual-enrolled children. A time-varying hazard analysis was also used to examine the impact of changes over time. The key variables were gender, age, race, county of residence, Medicaid eligibility category, and qualifying diagnosis. PRINCIPAL FINDINGS: Dual-enrolled children under one year of age, and those with qualifying diagnoses of anemia, hemophilia, asthma, epilepsy, and juvenile diabetes displayed especially high rates of ED use. Significant geographic variation in ED use remained after controlling for qualifying diagnoses, race/ethnicity, and other factors. African Americans displayed higher rates of ED utilization than non-Hispanic whites. Supplemental Security Income (SSI) recipients demonstrated higher utilization than other groups. CONCLUSIONS: Children dually enrolled in CSHCS and Medicaid face diverse challenges of both poverty and chronic illness. Differences in patterns of use highlight the importance, but also the difficulty, of developing systems of care to manage complex chronic conditions in low-income populations.

Adolescent↗
PubMed2004

Pediatrician self-efficacy for counseling parents of asthmatic children to quit smoking.

BACKGROUND: Although environmental tobacco smoke is a common trigger for asthma exacerbations in children, pediatricians infrequently counsel parents who smoke to quit. High physician self-efficacy, or self-confidence, in the ability to counsel parents about smoking cessation is associated with increased physician screening and counseling on this topic. However, it is not clear which factors are associated with high physician self-efficacy for counseling, such as previous training in smoking-cessation counseling or number of years in pediatric practice. OBJECTIVE: To identify factors associated with high levels of physician self-efficacy for 4 skills associated with smoking-cessation counseling. DESIGN: Cross-sectional survey. PARTICIPANTS: A national random sample of 829 primary care pediatricians. RESULTS: The response rate was 55% (457 of 829). The percentage of physicians with high levels of self-efficacy for screening parents and screening patients to identify smokers was 87% and 84%, respectively. The percentage of physicians with high levels of self-efficacy for counseling parents and patients was 59% for both groups. The presence of previous training in smoking-cessation counseling was associated with high levels of self-efficacy for all 4 skills including inquiring about an asthma patient's smoking status (odds ratio [OR]: 3.91; 95% confidence interval [CI]: 1.63, 9.37); inquiring about a parent's smoking status (OR: 2.51; 95% CI: 1.09, 5.75); counseling a patient to quit smoking (OR: 5.30; 95% CI: 3.02, 9.31); and counseling a parent to quit (OR: 4.96; 95% CI: 2.85, 8.61). Years since completion of residency were not associated with high self-efficacy. CONCLUSIONS: These findings suggest that formal training in smoking cessation has a significant impact on physician self-efficacy related to smoking cessation throughout a physician's career.

Asthma↗
PubMed2004

Decline in varicella-related hospitalizations and expenditures for children and adults after introduction of varicella vaccine in the United States.

OBJECTIVE: Universal childhood immunization against varicella in the United States, first recommended in 1995, was predicted to lead to significant decreases in varicella-related hospitalization rates and corresponding charges. Previous studies have not found such effects. We studied trends in varicella-related hospitalization rates and associated charges before and after introduction of varicella vaccine. METHODS: We examined hospitalization and charge data from the Nationwide Inpatient Sample for the years 1993-2001, representative of national hospitalization patterns for children and adults. We derived weighted estimates of population-adjusted, varicella-related hospitalization rates and inflation-adjusted, varicella-related hospital charges. RESULTS: The annual varicella-related hospitalization rate exceeded 0.5 hospitalizations per 10,000 US population from 1993 to 1995, declined to 0.26 per 10,000 by 1999, and again halved to 0.13 per 10,000 by 2001. Hospitalization rates declined most substantially among individuals primarily targeted for vaccination (0- to 4-year-old children) but decreased among youths aged 5 to 19 years and among adults as well. Concomitantly, varicella-related hospital charges declined from 161.1 million dollars (95% confidence interval: 130.5 million dollars-191.8 million dollars) in 1993 to 66.3 million dollars (95% confidence interval: 50.9 million dollars-81.7 million dollars) in 2001 (all 2001 US dollars). Among expected primary payers, inflation-adjusted declines in varicella-related hospital discharges-related charges accrued to Medicaid, private insurance, and "other" payers (including uninsured and self-pay) but not to Medicare. CONCLUSIONS: This national analysis indicates a clinically and statistically significant reduction in varicella-related hospitalizations for children and adults associated with childhood varicella immunization in the United States and a corresponding significant decrease in hospital charges.

Adolescent↗
PubMed2003

Variation in public and private supply of pneumococcal conjugate vaccine during a shortage.

CONTEXT: In late August 2001, a serious shortage of the heptavalent pneumococcal conjugate vaccine (PCV7) developed in 34 state immunization programs. In September 2001, the Centers for Disease Control and Prevention published revised recommendations advising physicians to prioritize PCV7 to specific groups of children. The effect of the shortage at the practice level is unknown. OBJECTIVE: To determine the variation between public and private markets in the supply of PCV7 and the nature and extent of the PCV7 shortage at the practice level. DESIGN, SETTING, AND PARTICIPANTS: Semistructured interviews with office staff responsible for ordering vaccines at private practices in 12 states were conducted between October 19 and November 2, 2001. MAIN OUTCOME MEASURES: Variation in supply of PCV7 obtained from public sources and through purchase on the private market. Supply was characterized into 3 categories: "no problem," "problem obtaining a consistent supply," and "out of stock." RESULTS: Interviews were completed at 405 practices, representing a response rate of 74%. Overall, 51% of practices reported at least 1 episode of being out of stock of public PCV7 and 64% of private PCV7, with significant state-to-state variation. Only 2 of 12 study states had a substantially higher proportion of practices experiencing out-of-stock episodes for public compared with private PCV7, while in 6 states public PCV7 was less frequently out of stock than private PCV7. Only 23% of practices in this study altered their administration policy for private PCV7, while 27% altered their policy for public PCV7. CONCLUSIONS: The distribution and supply of PCV7 varied between public and private supplies and between states during the shortage. Few practices changed their administration schedules in response to revised recommendations.

Pneumococcal Vaccines↗
PubMed2003

Under scrutiny: smallpox vaccine recommendations.

The eradication of smallpox is widely considered to be one of the great achievements of public health. However, international terrorism in the US and elsewhere has led to increasing concern about vulnerability to a smallpox bioterror attack. Timely vaccination is highly protective against smallpox but carries risks of morbidity and mortality. Significant debate has therefore emerged regarding the optimal strategy for defence. In principle, there are three options: either mass or limited vaccination prior to an attack; quarantine and vaccination of all suspected cases of smallpox following an attack with isolation and vaccination of potential case contacts; and mass vaccination after the identification of a case of smallpox. This paper reviews smallpox disease, smallpox vaccination and the development of current smallpox vaccination policy in the US. Mathematical models of the spread of smallpox and control strategies are reviewed to explore specific smallpox vaccine policy considerations. Limitations of these models are considered and recommendations are made for future research.

Humans↗
PubMed2003

Influence of insurance status and vaccine cost on physicians' administration of pneumococcal conjugate vaccine.

OBJECTIVE: In 2000, heptavalent pneumococcal conjugate vaccine (PCV7) was recommended for children younger than 2 years, but its high cost relative to other universally recommended childhood immunizations and variability in insurance coverage for the vaccine raised concerns. We investigated the influence of PCV7 cost and insurance coverage on physician recommendation of PCV7 to their patients and administration of PCV7 in their practices. METHODS: We conducted a mail survey from April to July 2001 of a random sample of 833 pediatricians and 788 family physicians in 24 states with different vaccine financing strategies (Vaccines for Children [VFC]-only; enhanced VFC; universal purchase). Physicians specified the proportion of children in their practice with insurance coverage for PCV7, where they recommend administering PCV7, and whether they have concerns about the cost of PCV7. RESULTS: The response rate was 60%. Overall, 87% of physicians recommend PCV7 for children younger than 2 years (99% pediatricians; 68% family physicians). Among physicians who recommend PCV7, 98% said that they would administer the vaccine in their own practices for children whose insurance covers the vaccine. However, only 56% of physicians who recommend PCV7 reported that all children in their practices had insurance coverage for the vaccine, whereas 24% of physicians reported 86% to 99% of children with coverage and 20% reported <or=85% of children with coverage. Among physicians in the last group with the lowest PCV7 insurance coverage rates in their practices, only 44% said that they would administer the vaccine in their own practices to children without PCV7 coverage, compared with 62% of physicians who provide care to children with higher rates of PCV7 coverage. Physicians in states with VFC-only vaccine financing strategies for PCV7 are less likely to administer PCV7 in their own practices to children without coverage than physicians in states with enhanced VFC and universal purchase strategies (48% vs 64% vs 74%). Almost one third of physicians who recommend PCV7 are concerned about the cost of PCV7; those with cost concerns are more likely to recommend that children without insurance coverage for PCV7 receive the vaccine at a public health clinic rather than in their own practices (45% vs 29%). Physicians with cost concerns are also more likely to say that they now screen children for insurance coverage more than for previously recommended vaccines (52% vs 21% for physicians without cost concerns). CONCLUSIONS: Nationwide, physician adoption of PCV7 recommendations is high, but where physicians recommend that PCV7 be administered differs significantly by children's variable insurance coverage for the vaccine and by state vaccine financing strategies. Physicians' concerns about the cost of PCV7 may foreshadow their responses to future children's vaccines that may be even more expensive.

Age Distribution↗
PubMed2002

A national survey of physician practices regarding influenza vaccine.

OBJECTIVE: To characterize U.S. physicians' practices regarding influenza vaccine, particularly regarding the capacity to identify high-risk patients, the use of reminder systems, and the typical period of administration of vaccine. DESIGN: Cross-sectional mail survey administered in October and November 2000. PARTICIPANTS: National random sample of internists and family physicians (N = 1,606). RESULTS: Response rate was 60%. Family physicians are significantly more likely than internists to administer influenza vaccine in their practices (82% vs 76%; P <.05). Eighty percent of physicians typically administer influenza vaccine for 3 to 5 months, but only 27% continue administering vaccine after the typical national peak of influenza activity. Only one half of physicians said their practices are able to generate lists of patients with chronic illnesses at high risk for complications of influenza, and only one quarter had used mail or telephone reminder systems to contact high-risk patients. Physicians working in a physician network (including managed care organizations) are more than twice as likely to use reminders as physicians in other practice settings (odds ratio, 2.04; 95% confidence interval, 1.17 to 3.55). CONCLUSIONS: Over three quarters of U.S. internists and family physicians routinely administer influenza vaccine, but few continue immunization efforts past the typical national peak of influenza activity. Many physicians may be limited by their practice data systems' capacity to identify high-risk patients. Despite the known effectiveness and cost-effectiveness of reminder systems, few physicians use reminders for influenza vaccination efforts. These findings raise concerns about meeting domestic influenza vaccination goals-especially for individuals with chronic illness and during periods of delayed vaccine availability-and the possibility of increased morbidity and mortality attributable to influenza as a result.

Attitude of Health Personnel↗
PubMed2002

Childhood vaccine purchase costs in the public sector: past trends, future expectations.

OBJECTIVES: We examined recent public-sector trends in childhood vaccine costs and estimated future costs. METHODS: We used public-sector price data to calculate vaccine purchase cost per child for children aged 0 to 6 years from 1975 to 2001. We fit a linear regression model to historical data and then used it to project costs per child from 2002 to 2020, adjusted to 2001 US dollars. RESULTS: Controlling for inflation, the cost of vaccine purchase per child climbed from $10 in 1975 to $385 in 2001. The cost of vaccine purchase in the year 2020 following recommendation of 7 additional vaccines is estimated to be $1225 per child (95% confidence interval = $891, $1559). CONCLUSIONS: The cost per child for recommended vaccines at public-sector prices may triple over the next 2 decades. These projections have implications for vaccine financing at federal and state levels.

Child↗
PubMedDate not supplied

Trends in diabetes mellitus among privately insured children, 1998-2002.

OBJECTIVE: To evaluate trends in health care administrative claims for childhood diabetes mellitus. METHODS: We conducted a serial cross-sectional study of a national sample of privately insured children < or = 18 years old. The number of subjects ranged from 306991 in 1998 to 974407 in 2002. We classified diabetes type by 2 schemes: one based on encounter claims only, and the other based on both encounter and pharmacy claims. The prevalence of diabetes was determined after adjusting for demographic changes in the study population, including age, proportion enrolled in managed care, and urban residence. RESULTS: The adjusted prevalence of diabetes overall increased from 183 (95% confidence interval [CI], 169-198) cases per 100,000 enrollees in 1998 to 218 (95% CI, 208-228) cases per 100,000 enrollees in 2002, primarily because of an increase in type 1 diabetes (based on both encounter and pharmacy claims, 135 [95% CI, 123-148] cases per 100000 enrollees in 1998 to 167 [95% CI, 158-176] cases per 100,000 enrollees in 2002). CONCLUSIONS: Our estimate of the overall prevalence of diabetes is consistent with national data. However, our finding that rising prevalence of type 1 diabetes appear to account for most of the increase in diabetes claims is surprising. Future research will be needed to validate these results.

Adolescent↗
PubMedDate not supplied

Effect of state vaccine-financing strategy on hepatitis B immunization in hospital nurseries.

OBJECTIVE: Changes in recommendations for newborn hepatitis B vaccination offer an opportunity to examine the association between newborn hepatitis B vaccination in hospital nurseries and state vaccine-financing strategies, which include the Vaccines for Children (VFC) program alone, an enhanced VFC program, and universal purchase. METHODS: We conducted a cross-sectional telephone survey of nursery directors from a national random sample of 290 hospital nurseries. RESULTS: Directors at 207 (71%) of 290 eligible nurseries responded. After the end of the temporary suspension of the hepatitis B vaccine birth dose, 59 (29%) of the 207 nurseries did not return to their previous policy and adopted a less strict policy for offering this vaccination to low-risk infants. In logistic regression analysis, compared with nurseries in states with VFC-only financing, nurseries in states with universal purchase financing were more likely to return a strict policy of routinely offering hepatitis B vaccination (odds ratio [OR], 0.09; 95% confidence interval [CI], 0.11-0.78), and nurseries in states with enhanced VFC financing were less likely to return to a strict policy of routinely offering hepatitis B vaccination (OR, 3.00; 95% CI, 1.14-7.88). The presence of residents or students in the nursery was associated with a lower likelihood of not returning to a strict policy of routinely offering hepatitis B vaccination (OR, 0.32; 95% CI, 0.10-0.97). CONCLUSIONS: State vaccine-financing strategy for the birth dose of hepatitis B vaccine is associated with nursery policy to routinely offer this vaccine in the nursery. The temporary change in national hepatitis B vaccination recommendations in 1999 served as a window of opportunity for the adoption of new hospital nursery policies and showed the effects of state vaccine financing on the adoption of newborn immunization recommendations.

Financing, Government↗
PubMedDate not supplied

Factors associated with variations in parental social support in primary care pediatric settings.

OBJECTIVE: To examine social support (SS) among parents across sociodemographically distinct pediatric outpatient settings. METHODS: We conducted a cross-sectional, self-administered, anonymous parent survey in 3 primary care sites in a Midwestern metropolitan area: inner-city health center, urban group practice, and suburban group practice. Participants were parents of children aged 6 weeks to 36 months. The main outcome measure was overall SS as measured by a previously validated 10-item instrument. Multivariate linear regression modeling was used to examine sociodemographic and health factors associated with overall SS scores. RESULTS: The study sample included 463 parents. The strongest sources of SS were a significant other or spouse and parent's parent or grandparent. The range for overall SS was 0 to 20, with a mean score of 12.1 (SD, +/-4.2). Parents with overall SS in the lowest quartile (n = 123) comprised 43% of parents at the inner-city health center compared with 23% of parents at the urban practice and 16% of parents at the suburban practice. In a multivariate model, factors associated with lower overall SS were race other than white or black, single or cohabiting marital status, poorer parental health, and parental depressive symptoms. CONCLUSIONS: Although parental SS was lowest in the most socioeconomically disadvantaged community in this sample, parents in all 3 communities had widely varying levels of support. Providers may gain insights about parents at increased risk for low SS by asking about parents' own physical and mental health.

Adult↗
PubMedDate not supplied

When insurance status is not static: insurance transitions of low-income children and implications for health and health care.

OBJECTIVES: Among low-income children, to characterize the frequency of transitions in health insurance coverage and examine associations of transitions with health status and health care access. METHODS: Data from the 1999 National Survey of America's Families were used in weighted analyses to identify sociodemographic characteristics associated with health insurance transitions for children living in households with income <200% of the federal poverty level over the preceding 12 months. In logistic regression models, we examined associations of insurance transitions with children's health status (fair/poor health), postponement of children's medical care or prescription medications, and lack of physician visits. RESULTS: Among 27.93 million low-income children in 1999, 5.7 million (20.4%) had experienced an insurance transition in the preceding year. Non-Hispanic black children (24.5%) and children whose parents did not have a partner or spouse (23.5%) were significantly more likely than other children to have experienced transitions. Hispanic children (16%) were least likely to have experienced transitions. Compared with children with continuous private coverage, children who had transitioned from public to private coverage were more likely to report fair or poor health, children who experienced transitions that included a period of no coverage were more likely to report postponed medical care and prescription drugs, and children who experienced a no-coverage-to-private-coverage transition were more likely to have foregone physician visits. CONCLUSION: Transitions in insurance coverage affect many low-income children and may represent barriers to their health care. Considering insurance transitions may provide a more complete picture of children's health and health care utilization.

Child↗
PubMedDate not supplied

State legislator gender and other characteristics associated with sponsorship of child health bills.

OBJECTIVE: To examine the characteristics of state legislators who introduce child health bills. METHODS: We conducted a cross-sectional analysis of all bills introduced in Colorado, Louisiana, and Michigan during the 1997-1998 legislative session. We identified the topic for each bill while blinded to legislator characteristics. The primary study outcome was whether the bill topic related to child health. We also categorized whether the bill was signed into law. We examined associations between the outcomes and characteristics of the sponsoring legislators (gender, political party, terms served, chairpersonship of committees, legislative chamber, membership in the legislature's Black Caucus). RESULTS: During 1997 and 1998, legislators in the 3 study states introduced 9833 bills (1234 in Colorado, 4905 in Louisiana, and 3694 in Michigan). Sixty-five bills (0.66%) related to child health issues. Child health bills comprised a significantly higher proportion of all legislation introduced by female legislators compared with male legislators (1.5% vs 0.5%, P <.001). Of bills introduced by Black Caucus members, 1.4% pertained to child health compared with 0.59% of bills introduced by nonmembers (P <.01). In contrast, 0.23% of bills introduced by committee chairpersons pertained to child health versus 0.96% of bills introduced by nonchair legislators (P <.001). These associations remained statistically significant in multivariate analyses controlling for state effects. Whether child health bills were signed into law was not associated with other legislator characteristics. CONCLUSIONS: This study offers valuable insights about the different roles of women, Black Caucus members, and committee chairpersons in the state legislative process regarding children's health.

Administrative Personnel↗