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Health care coverage for children who are on and off welfare.

Access to adequate health insurance is a key concern of families with children at all income levels. Since 1965, mothers and children on welfare have had health care coverage through the Medicaid program, which has provided a health care safety net for welfare recipients. Although most Americans are insured through their employers, families who leave welfare for employment often find themselves in jobs that do not offer health care coverage, adding to the ranks of the uninsured. This article examines the extent to which poor children and their mothers have private insurance, Medicaid, or no health insurance at all. It documents how recent expansions of Medicaid eligibility to low-income children who do not receive welfare have improved the insurance status of children, though these changes have not helped the mothers who leave welfare for work. Citing evidence that health insurance options influence the welfare and employment decisions of women whose families face health problems, the article suggests that implementing welfare reform at a time when rates of private insurance coverage are declining will be challenging and may expose some families to health risks.

Aid to Families with Dependent Children↗

Effects of state reforms on health insurance coverage of adults.

States have tried a number of strategies to reduce the growing number of uninsured people. These include Medicaid expansions and various insurance reforms, such as low-cost plans, subsidized insurance products, risk pooling, open enrollment and continuity of coverage requirements, and community rating. Using data from 1989 to 1994, we examine the impact of such policies on health insurance coverage for adults. We find that few state policies have succeeded in increasing health insurance coverage. For those that work, impacts are very modest or are accompanied by adverse effects such as crowdout. Implementing effective state policies to reduce the number of uninsured remains a great challenge.

Adolescent↗

Monitoring equity in immunization coverage.

This paper analyses trends in coverage of three doses of diphtheria-pertussis-tetanus vaccine (DPT3) by wealth groups in selected countries. It discusses the depth of disparities in coverage by wealth and changes during the 1990s. Complete assessment of equity in income and its trends have been discussed in other papers, however issues related to children's well-being have often been brushed aside because the comparable data needed to fully understand and rectify inequalities is lacking. A focal point of this paper pertains to gathering any and all information recorded about the immunization of children and then transcribing these data so that it is applicable to all countries. We analyse the technical difficulties and methodological solutions that would enable comparisons to be made between various measures of inequity taken from different surveys at two or three points in time among a variety of subpopulations in order to obtain disaggregated data. This paper argues for a simultaneous analysis of changes in averages and disparities in immunization coverage along variables of interest, such as wealth, gender and place of residence in order to achieve a better understanding of trends. We also focus on measurement issues and describe trends in immunization by wealth. We conclude with a brief discussion of issues related to monitoring equitable outcomes and offer suggestions for further research. In addition, the paper presents some lessons that can be drawn about monitoring and policies. We hope that this analysis of patterns of disparities will help policy-makers in devising, proposing and executing efficient policies and interventions.

Cross-Cultural Comparison↗

Physician coverage in the pediatric emergency room. A national survey.

Pediatric emergency services are provided by most pediatric teaching hospitals in the United States. However, little information has been published regarding staffing patterns. The present study assessed the staffing of 155 such residency programs. While two thirds of the programs provide 24-hour on-site resident coverage in their pediatric emergency rooms, only 10% utilize attending pediatricians on a similar basis. Although coverage increases with increasing training-program size and emergency-room patient volume, the majority (79%) of even the largest residency programs do not provide 24-hour attending pediatrician coverage in the emergency room. Administrators of pediatric residency programs are urged to improve the staffing of their emergency rooms to include attending pediatricians on a 24-hour basis.

Emergency Service, Hospital↗

Insurance coverage and residents' experience in a pediatric teaching clinic.

To examine the relationship between insurance coverage and the diagnostic content of residents' experience in a hospital-based pediatric teaching clinic, we analyzed outpatient problem lists for 6543 patients seen in our clinic over a 15-month period. Problem-list contents were categorized using diagnostic clusters. The frequency distribution of clustered problems was compared for patients with four types of insurance coverage: indemnity insurance, health maintenance organization, Medicaid, and no insurance. The four insurance categories differed in the overall distribution of problems, but the differences could not be attributed to a disparity in the frequency of any single diagnosis or diagnostic cluster. We conclude that there was no important effect of insurance coverage on the diagnostic content of residents' experience in a teaching clinic.

Child↗

Media coverage of scientific meetings: too much, too soon?

CONTEXT: Although they are preliminary and have undergone only limited peer review, research abstracts at scientific meetings may receive prominent attention in the news media. We sought to describe news coverage of abstracts, characterize the research, and determine subsequent full publication in the medical literature. METHODS: We searched Lexis-Nexis to identify news stories printed in the 2 months following 5 scientific meetings held in 1998 (12th World AIDS Conference, American Heart Association, Society for Neuroscience, American Society of Clinical Oncology, and the Radiological Society of North America). We searched MEDLINE and contacted authors to determine subsequent publication in the medical literature within 3-3.5 years of the meetings. RESULTS: A total of 252 news stories reported on 147 research abstracts (average, 50 per meeting); 16% of the covered abstracts were nonhuman studies, 24% randomized trials, and 59% observational studies. Twenty-one percent of the human studies were small (ie, involving <30 subjects). In the 3 years after the meetings, 50% of the abstracts were published in high-impact journals (based on Institute for Scientific Information ratings), 25% in low-impact journals, and 25% remained unpublished. The publication record of the 39 abstracts receiving front-page newspaper coverage was almost identical to the overall rate. Meeting organizers issued press releases for 43 abstracts; these were somewhat more likely to receive prominent news coverage (35% covered on front page vs 23%, P =.14), but were no more likely to be published. CONCLUSIONS: Abstracts at scientific meetings receive substantial attention in the high-profile media. A substantial number of the studies remain unpublished, precluding evaluation in the scientific community.

Congresses as Topic↗

Volume of extracellular polymeric substance coverage of individual Acidithiobacillus ferrooxidans bacterium measured by atomic force microscopy.

The Acidithiobacillus ferrooxidans response to stress associated with the drying process is known to be the production of extracellular polymeric substance (EPS) coverage. Here, samples of A. ferrooxidans suspensions grown in 1.8 pH and 3.0 pH and dried on mica and silicon are shown to form a structure of isolated bacteria. Individual bacteria coverage patterns were imaged by atomic force microscopy (AFM) on hydrophobic (silicon) and hydrophilic (mica) substrates. A comparison of images of covered and uncovered bacteria establish the volume of individual EPS coverage. The EPS production for bacteria on hydrophobic substrates shows a substantial decrease (a factor of 30) in the EPS volume per bacterium when compared with the one on hydrophilic substrates. Shape and volume determination of EPS structures on bacteria as a function of hydrophobicity or hydrophilicity of the substrate may help to determine the functions of EPS on bacterial aggregates.

Acidithiobacillus↗

Coverage of soft-tissue defects of the hand with free fascial flaps.

Coverage of exposed functional structures such as tendons, bones, vessels, or nerves at the dorsal and palmar surface of the hand requires thin, supple tissue to provide adequate range of motion and a satisfying aesthetic result. The purpose of this retrospective study was to evaluate the functional and aesthetic results after coverage of the hand with free fascial flaps. From 1994-2002, 14 patients underwent free fascial flap coverage of the hand with 4 tempo-parietal fascia flaps and 11 serratus fascia flaps. Eight patients could be reexamined and answered a questionnaire about their satisfaction with the functional and aesthetic results. The mean follow-up was 41.7 months. Average active range of motion of the hand, functional improvement, and the aesthetic result were satisfying in all follow-up patients. No secondary debulking or other contouring procedures were required. We recommend the use of free fascial flaps as a valuable alternative to fasciocutaneous or muscle flaps, since the functional results are excellent, no additional procedures were necessary, and the aesthetic results are appealing.

Adult↗

Extended coverage first-pass perfusion imaging using slice-interleaved TSENSE.

Parallel imaging applied to first-pass, contrast-enhanced cardiac MR can yield greater spatial coverage for a fixed temporal resolution. The method combines rate R=2 acceleration using TSENSE with shot-to-shot interleaving of two slices. The square root R SNR loss is largely compensated for by a longer effective repetition time (TR) and increased flip angle associated with slice interleaving. In this manner, increased spatial coverage is achieved while comparable or better image quality is maintained. Single-heartbeat temporal resolution was accomplished with spatial coverage of eight slices at heart rates up to 71 bpm, six slices up to 95 bpm, and four slices up to 143 bpm. Experiments in normal subjects (N=6) were performed to assess signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) values.

Artifacts↗

Two-point T1 measurement: wide-coverage optimizations by stochastic simulations.

Stochastic reliability of T1 measurement from image signal ratios is examined in the ideal case by stochastic simulations in the context of wide-coverage optimizations. Precise measurements prove to be accurate, and accurate ones precise. Sign-preserved inversion-recovery (IR)/non-IR techniques are the best ratio method, reciprocal non-IR/IR ones being equivalent, but inconvenient. Wide-coverage optima are relatively unsharp. Suggested guidelines for covering the 150- to 1500-ms T1 band are minimal relevant TE; TI about 400 ms; effective repetition times about in the ratio, TR2(IR)/TR1 (non-IR) = 2.5-3.0, and in a sum as long as possible up to about TR1 + TR2 = 3.5-4.0 s; signal-averaging after and only after TR1 + TR2 has been lengthened to the said region. Also suggested are different guidelines for covering T1 bands, 120-1200 and 200-1800 ms. Typically, precisions and accuracies improve linearly or faster with increasing S/N and (S/N)2, respectively. Unnecessarily high pixel resolutions or thin slicings exact great penalties in accuracies. Progressively shortening TR1 eventually transforms a wide coverage into a sharp targeting with small potential gains in a narrow T1 locality and large compromises almost everywhere else. The simulations yield an insight into applicabilities of standard error propagation analyses in two-point T1 measurement.

Biometry↗

Toward single breath-hold whole-heart coverage coronary MRA using highly accelerated parallel imaging with a 32-channel MR system.

Coronary MR angiography (CMRA) is generally confined to the acquisition of multiple targeted slabs with coverage dictated by the competing constraints of signal-to-noise ratio (SNR), physiological motion, and scan time. This work addresses these obstacles by demonstrating the technical feasibility of using a 32-channel coil array and receiver system for highly accelerated volumetric breath-hold CMRA. The use of the 32-element array in unaccelerated CMRA studies provided a baseline SNR increase of as much as 40% over conventional cardiac-optimized phased array coils, which resulted in substantially enhanced image quality and improved delineation of the coronary arteries. Modest accelerations were used to reduce breath-hold durations for tailored coverage of the coronary arteries using targeted multi-oblique slabs to as little as 10 s. Finally, high net accelerations were combined with the SNR advantages of a 3D steady-state free precession (SSFP) technique to achieve previously unattainable comprehensive volumetric coverage of the coronary arteries in a single breath-hold. The merits and limitations of this simplified volumetric imaging approach are discussed and its implications for coronary MRA are considered.

Coronary Angiography↗

Ranking states' immunization coverage: an example from the National Immunization Survey.

The National Immunization Survey (NIS) provides state-level estimates of preschool immunization coverage. These coverages are frequently presented in ranked lists, and ranks are frequently over-interpreted. In this paper, we highlight the difficulty in interpreting ranked point estimates. To demonstrate the uncertainty of ranks, parametric bootstrap methods were used to derive 90 per cent confidence intervals for ranks of state vaccination coverage levels among preschool children. We graphically compared states to a reference state. If NIS data are used to rank states, one should consider presenting confidence intervals for rank and the results of comparisons of one state with another graphically.

Child, Preschool↗

Longitudinal and repeated cross-sectional cluster-randomization designs using mixed effects regression for binary outcomes: bias and coverage of frequentist and Bayesian methods.

As medical applications for cluster randomization designs become more common, investigators look for guidance on optimal methods for estimating the effect of group-based interventions over time. This study examines two distinct cluster randomization designs: (1) the repeated cross-sectional design in which centres are followed over time but patients change, and (2) the longitudinal design in which individual patients are followed over time within treatment clusters. Simulations of each study design stipulated a multiplicative treatment effect (on the log odds scale), between 5 and 15 clusters in each of two treatment arms, and followed over two time periods. Estimation options included linear mixed effects models using restricted maximum likelihood (REML), generalized estimating equations (GEE), mixed effects logistic regression using both penalized quasi likelihood (PQL) and numerical integration, and Bayesian Monte Carlo analysis. For the repeated cross-sectional designs, most methods performed well in terms of bias and coverage when clusters were numerous (30) and variability across clusters of baseline risk and treatment effect was modest. With few clusters (two groups of five) and higher variability, only the Bayesian methods maintained coverage. In the longitudinal designs, the common methods of REML, GEE, or PQL performed poorly when compared to numerical integration, while Bayesian methods demonstrated less bias and better coverage for estimates of both log odds ratios and risk differences. The performance of common statistical tools for the analysis of cluster randomization designs depends heavily on the precise design, the number of clusters, and the variability of baseline outcomes and treatment effects across centres.

Bayes Theorem↗

Surface Coverage and Its Determination: Role of Acid-Base Interactions in the Surface Treatment of Mineral Fillers

The role of acid-base interactions in the nonreactive surface treatment of mineral fillers was studied by a dissolution method. The effect of treatment on the surface properties of CaCO3 covered with stearic acid was determined by ESCA measurements and by the calculation of the basicity of the treated fillers. The dissolution measurements were carried out in twelve different solvents. The maximum amount of surfactant adsorbed on the filler surface (cmax) proved to be independent of the acid-base character of the solvent, while the amount bonded proportionally (c100) depended strongly on it. The results showed that competitive processes determine the surface coverage of the filler: the adsorption of the surfactant and the solvent on the filler surface competes with the solution of the treating material in the solvent. Sedimentation experiments gave valuable information about the strength of solvent/filler interaction. The surface characteristics of the filler changed with surface coverage; the surfactant concentration at which basicity attains its minimum agrees well with the monolayer coverage determined by ESCA and with the c100 value obtained in apolar solvents. The results have practical relevance as well, similar competitive solution/adsorption processes may take place also in composites containing surface treated fillers. Copyright 1997 Academic Press. Copyright 1997Academic Press

Journal Article↗

Effect of Insoluble Surfactants on the Pressure-Driven Motion of a Drop in a Tube in the Limit of High Surface Coverage.

The effect of surfactants on the axisymmetric pressure-driven motion of a droplet in a tube is investigated under low Reynolds number conditions. In the presence of surface-active impurities, the motion of the drop results in constant redistribution of the adsorbed surfactant along the interface by convection and diffusion, leading to nonuniformities in interfacial tension (i.e., Marangoni stresses) which modify the viscous stress balance at the interface. These, in turn, affect the mobility of the drop and its steady or transient shape deformations. In this study, the steady-state behavior of such a drop is examined in the presence of nondilute concentrations of bulk-insoluble surfactants on the surface of the drop. The boundary integral method is used in conjunction with a finite-difference scheme to solve the unsteady surface convective-diffusion equation for surfactant transport. The Frumkin adsorption framework is used to explore the effects of monolayer saturation and nonideal surfactant interactions on the steady drop shape and speed in the limit of high surface coverage. It is found that for surfactants with strong cohesive interactions, the drop mobility increases with increasing surface coverage, attaining maximum mobility at about 50% initial coverage. Furthermore, surface-convection-dominated systems with strong cohesive interactions exhibit surface flow patterns corresponding to the formation of a stagnant cap at the trailing end of the drop. All other systems exhibit surface flow patterns corresponding to uniform retardation of interface mobility as a fully immobilized interface is approached with increasing surface convection. Copyright 1999 Academic Press.

Journal Article↗

[Vaccination against hepatitis B in school: factors influencing acceptance and evaluation of general vaccination coverage ].

The second vaccination campaign against Hepatitis B in Lausanne concerned 1243 students of the seventh grade. This campaign was actively supported by personalized information given to each adolescent in the class room. The decisions were collected in the same way, and in necessary the nurse phoned the parents for further information. In comparison with the previous year, the coverage had grown from 63.5% to 78.5%, but varied in each class between 42% and 92%, whatever the class type. The factors which influence acceptance of the vaccination are coverage for the other vaccines, origin, and class, which has up to five times more effect than the other factors. Assessment of the vaccination coverage against Diphteria, Tetanus, Poliomyelitis, Pertussis, Measles and MMR is given in relation to the acceptance of the Hepatitis B vaccination and the class type.

Adolescent↗

A cross-sectional study on vaccine coverage and seroprevalence in schoolchildren in Andorra.

A cross-sectional study on vaccine coverage and vaccine effectiveness was carried out on a randomized sample of the cohort of schoolchildren born in 1983 attending school in Andorra, prior to the introduction of a Systematic Immunisation Plan that included centralised import and delivery of vaccines to vaccinating clinics, surveillance of the cold-chain during vaccine delivery, and a clearly-defined immunization schedule against diphtheria, tetanus, -pertussis, polio, mumps, rubella and measles. Vaccine coverage was estimated from vaccination card records; history of disease and sociodemographic variables were obtained through a questionnaire to the children's parents and vaccine effectiveness was estimated through serum antibody testing. Vaccine coverage levels for DTP and OPV were 97.8% for both. Protective serum antibody prevalence was correspondingly high except for the polio viruses. The authors suggest that decreased vaccine effectiveness, probably due to poor preservation of the cold chain, might be the cause of this finding. In countries or regions with an otherwise developed organisation of health services, an important issue like this can still be overlooked.

Andorra↗

Evaluation of vaccination coverage.

The cluster sampling methodology based on WHO module on "Evaluate Vaccination Coverage" recommended by Ministry of Health and Family Welfare, Government of India, 1987 was followed to evaluate the vaccination coverage of eligibles. Out of the 215 eligible children between 12-23 months of age, 44.65 38.61 and 16.74 per cent were found to be fully, partially and unimmunized respectively. The dropout rate for OPV and DPT was 21.23 while it was 4.03 per cent for TT. Based on the studied facts responsible for non or partial immunization, suggestions have been made to accelerate the coverage and reduce the dropout rate.

BCG Vaccine↗