H. Stephen Kaye

H. Stephen Kaye
University of California, San Francisco | UCSF

About

88
Publications
15,190
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3,978
Citations
Education
September 1978 - June 1983
Stanford University
Field of study

Publications

Publications (88)
Article
Objectives. To explore the effect of the Affordable Care Act (ACA) on disparities in access to health care based on disability status, as well as age, income, race, and ethnicity. Methods. In this study, I used logistic regression to analyze nationally representative data from 128 000 respondents to the US National Health Interview Survey from 2008...
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In 2014 California implemented a demonstration project called Cal MediConnect, which used managed care organizations to integrate Medicare and Medicaid, including long-term services and supports for beneficiaries dually eligible for Medicare and Medicaid. Postenrollment telephone surveys assessed how enrollees adjusted to Cal MediConnect over time....
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Researchers, policy experts, and advocates participating in an invitational conference discussed research needed to address pressing policy issues in long-term services and supports (LTSS). Future research on need for LTSS should focus on projections of need, geographic variations, equity, and unmet needs of consumers and caregivers. Research on ac...
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In response to a new Federal initiative to improve the U.S. long-term services and supports (LTSS) system, this commentary discusses an array of policies and practices that could potentially improve LTSS provision by shifting from institutional to community-based services, increasing equity across populations, offering consumers more choice and con...
Conference Paper
The presence of a disability is typically assessed in one of three ways: a limitation in complex, role-related activities such as working, keeping house, or going to school; a limitation in functioning, such as walking, climbing stairs, seeing, hearing, or remembering; or a limitation in one or more basic daily activities, such as bathing, dressing...
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The aging of the baby-boom generation, as well as predicted growth in the number of people with disabilities, is expected to increase the demand for long-term services and supports dramatically. This study analyzed data from the Survey of Income and Program Participation from 1984 to 2010 to discern trends among noninstitutionalized working-age adu...
Conference Paper
A comparison of two research studies on employment of people with disabilities indicates the different views of employers and successful employees with disabilities. This presentation moves research to practice. Two different kinds of research were conducted with two distinct groups. The first project surveyed employers regarding their attitudes...
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To explore trends in the prevalence of self-reported visual impairment in the noninstitutionalized adult US population during the 27-year period from 1984 to 2010. Data obtained from the National Health Interview Survey (NHIS) and the Survey of Income and Program Participation (SIPP) were used to analyze trends in the prevalence of self-reported vi...
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States are shifting Medicaid spending on long-term services and supports from institutional to home and community-based services, a process known as rebalancing. Using fifteen years of state expenditure data, a statistical model was developed to assess the effect of rebalancing on overall spending for long-term services and supports. The model indi...
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The Affordable care Act (ACA) legislation of 2010 has three important voluntary provisions for the expansion of home- and community-based services (HCBS) under Medicaid: A state can choose to (1) offer a community first choice option to provide attendant care services and supports; (2) amend its state plan to provide an optional HCBS benefit; and (...
Conference Paper
Many people with disabilities want to work, but face barriers to employment that have resulted in continually low employment rates. Yet successfully employed people with disabilities have valuable experience in obtaining work and thriving in the workplace, and are likely to have devised strategies that could help others; these have not been systema...
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Many people with disabilities want to work, but face employment barriers that have resulted in dismal employment rates. Successfully employed people with disabilities have valuable experience that can help others seeking employment, yet research literature provides little information about their strategies for discussing disabilities with employers...
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Despite persistently low employment rates among working-age adults with disabilities, prior research on employer practices and attitudes toward workers with disabilities paints a generally rosy picture of successfully accommodated workers in a welcoming environment. Findings from previous studies might have been biased because of either employer se...
Conference Paper
It is often suggested that workers with disabilities are the first to be fired in bad economic times and the last to be hired once conditions improve. The recent introduction of new, state-of-the-art disability measures into the monthly U.S. Current Population Survey (CPS), coinciding with the early stages of the current recession, offers an unprec...
Article
New data available from the Current Population Survey (CPS) indicate that between October 2008 and June 2010, job losses among workers with disabilities far exceeded those of workers without disabilities; this labor market volatility resulted in the proportion of employed U.S. workers identified as having disabilities declining by 9 percent
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Research on employer practices and attitudes toward workers with disabilities generally paints a rosy picture of successfully accommodated workers in a welcoming environment. Yet, nearly two decades after the passage of the Americans with Disabilities Act (ADA), there is little evidence of improvement in employment rates among working-age adults wi...
Article
Public policy initiatives have not succeeded in increasing employment levels among people with disabilities, reducing poverty rates, or decreasing reliance on public benefit programs. Low levels of participation in Ticket to Work and the Medicaid Buy-Ins may indicate that, by focusing on reducing work disincentives and increasing access to rehabili...
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This article presents a profile of household-resident U.S. adults using wheeled mobility equipment (WME) in 2005, trends in WME use from 1990 to 2005, and data on accessibility features and problems from 1994-97. Data were obtained from the Survey of Income and Program Participation (SIPP) and the National Health Interview Survey on Disability (NHI...
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Long-term care in the United States is needed by 10.9 million community residents, half of them nonelderly, and 1.8 million nursing home residents, predominantly elderly. Ninety-two percent of community residents receive unpaid help, while 13 percent receive paid help. Paid community-based long-term care services are primarily funded by Medicaid or...
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The proportion of workers reporting disabilities varies tremendously across occupations. Although differences in the occupational distributions may partly explain the large disparities in earnings and job security between workers with and without disabilities, little is known about the reasons that workers with disabilities are underrepresented in...
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Medicaid spending on home and community-based services (HCBS) has grown dramatically in recent years, but little is known about what effect these alternatives to institutional services have on overall long-term care costs. An analysis of state spending data from 1995 to 2005 shows that for two distinct population groups receiving long-term care ser...
Conference Paper
Latinas with disabilities are doubly underserved in obtaining preventive healthcare screenings. In a pilot community-based research project, Central Coast Center for Independent Living and researchers from the University of California San Francisco developed and implemented a culturally appropriate intervention to teach such women about breast canc...
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Assistive technology is essential to the lives of many people with disabilities, but disparities in usage put certain segments of the disability population at a particular disadvantage. This article uses survey data and statistical modeling to explore differences in technology usage across disability subpopulations. Responses to a 2005 survey of ne...
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Personal assistance services (PAS) are essential for many people of all ages with significant disabilities, but these services are not always available to individuals at home or in the community, in large part due to a significant bias toward institutions in the Medicaid program. This study aims to provide an estimate of the expense of a mandatory...
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The workforce providing noninstitutional personal assistance and home health services tripled between 1989 and 2004, according to U.S. survey data, growing at a much faster rate than the population needing such services. During the same period, Medicaid spending for such services increased dramatically, while both workforce size and spending for si...
Article
For people with disabilities, work remains the best route to independence and enacting one's own choices. Assistive technology (AT) is often crucial in removing barriers to employment, and in enabling workers with disabilities to work more productively. A participatory action research project known as Community Research for Assistive Technology sur...
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This study used a person-environment (P-E) framework to examine individual capabilities and social and physical environmental attributes for their association with unmet assistance needs in activities of daily living (ADLs). Analyses were replicated among five ADLs (bathing, dressing, transferring, toileting, eating) and test the relative risk of a...
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Perceived unmet need for personal assistance services (PAS) in activities of daily living (ADLs) and instrumental ADLs and its association with reduced hours of help received and with adverse consequences due to lack of help are examined for adults aged 18 and older using data from the 1994-1997 National Health Interview Survey on Disability. A two...
Article
About one fifth of the adult population with disabilities living in the community moved during a 12-to 24-month period between 1994 and 1996. This article examines the extent to which the ability to perform activities of daily living (ADL) and instrumental activities of daily living (IADL) was associated with these moves. Data are from the 1994-199...
Article
This report provides data on the use of mobility devices in the United States by providing a detailed profile of the population using these devices. It covers their demographic characteristics; health and disability status, including diagnoses and impairments, physical functioning, and activities of daily living; and health insurance status. The re...
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This report discusses the findings of national surveys that show little evidence of improvement in the economic well-being of Americans with disabilities. Positive and negative findings include: (1) the labor force participation rate for people with disabilities aged 18-64 remained more or less constant, at about 52 percent between 1990 and 1994; (...
Article
This abstract uses graphs and text to summarize recent statistics on the education of children with disabilities based on data from the U.S. Department of Education. It reports that 12.2 percent of students enrolled in American schools in 1993-94 were officially designated as having disabilities. More than two-thirds of students have mental or emot...
Article
This abstract summarizes recent statistics on those needing assistance in Activities of Daily Living (ADLs), along with participation rates for various proposed benefit programs, based on an analysis of the 1990-91 Survey of Income and Program Participation. Analysis indicates: (1) an estimated 1.9 percent of the population has difficulty performin...
Article
This report presents data in text and graphs on the situation of people with disabilities in the United States in the context of requirements of the Americans with Disabilities Act. An introduction identifies four reasons for the observed slow pace to compliance with disability-rights laws: (1) ignorance about what constitutes accessibility and rea...
Article
This statistical abstract summarizes recent data on the relationship between disability and employment. The statistics come from the Current Population Survey, the Census Bureau's Survey of Income and Program Participation, a poll of 1,000 Americans with disabilities, and administrative data on recipients of Social Security Disability Insurance (SS...
Article
The TPC/Two-Gamma facility at the SLAC e+e- storage ring PEP was used to study the reactions gammagamma*-->eta and gammagamma*-->eta'. The etagamma*gamma and eta'gamma*gamma transition form factors were measured as functions of Q2, the negative of the invariant mass squared of the tagged photon, in the range 0.1
Article
The MAC detector at PEP recorded data for an integrated luminosity of 335 pb−1 between 1980 and 1986. The design of this low-cost MAgnetic Calorimeter was optimized for electron and muon identification, as well as for the measurement of hadronic energy flow. Muon identification is available over 96% of the solid angle, and MAC was the first detecto...
Article
In the study of rapidity distributions of charged pions produced ine + e – annihilation at 29 GeV, we observe a significant dip in the rapidity distributions aty0 for events with low sphericity. A comparison of data with several QCD-based phenomenological models strongly suggests that this structure is related to the emission of multiple soft and/o...
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We have observed the formation of two spin-one mesons in gammagamma fusion reactions in which one photon was highly virtual. The first, consistent with being the JPC=1++ f1(1285), was seen in the final state etapi+pi- (eta-->gammagamma), as was the eta'(958). We have previously reported the observation of the second spin-one state, the X(1420), in...
Article
We have observed formation of the f1 (1285) in the reaction e+e-→e+e-π+π-η(η→γγ). Its γγ∗ width is determined in several Q2 bins. The γγ coupling parameter for the f1 (1285) is found to be 2.4±0.5±0.5 keV. This value is compared to that for the X (1420), another J=1 state formed in γγ fusion reactions, which may belong to the same meson nonet.
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We have searched for the two-photon production of the /eta//sub c/, /chi/â and /chi/â charmonium states at the e/sup +/e⁻ collider PEP in the channels /gamma//gamma/ /yields/ K/sup +-/K/sub S/°/pi//sup -+/, /gamma//gamma/ /yields/ K/sup +/K⁻/pi//sup +//pi/⁻, /gamma//gamma/ /yields/ /pi//sup +//pi/⁻/pi//sup +//pi/⁻ and /gamma//gamma/ /yie...
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Results are presented on the exclusive production of four-prong final states in photon-photon collisions from the TPC/Two-Gamma detector at the SLAC e+e- storage ring PEP. Measurement of dE/dx and momentum in the time-projection chamber (TPC) provides identification of the final states 2pi+2pi-, K+K-pi+pi-, and 2K+2K-. For two quasireal incident ph...
Article
We set an upper limit on the branching fraction B(K-K0)<0.26% at the 95% confidence level. The data sample was obtained with the TPC/Two-Gamma detector facility at the SLAC e+e- storage ring PEP. The process K-K0 is related via SU(3) to the second-class-current decay. Our limit is nearly 20 times smaller than the recently reported branching fractio...
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The two-photon production of the eta meson has been observed, and a value has been determined for the two-photon eta decay width by a measurement of the cross section sigma(e+e--->e+e-eta) where eta-->gammagamma. The measurement was made with the TPC/Two-Gamma facility at the SLAC e+e- collider PEP, with an accumulated data sample of 64.5 pb-1. The...
Article
Two-photon formation of the in the reaction e+e-e+e-me+e-+- has been studied for nearly real and virtual photons at an e+e- center-of-mass energy of 29 GeV. The width of the is found to be 4.50.3(stat.)0.7(syst.) keV. The measured dependence of this width upon the photon four-momentum squared in the range 05 GeV2 agrees with predictions both from Q...
Article
Using the data accumulated at LEP in 1989 and 1990 with the ALEPH detector, the inclusive and exclusive branching ratios of the t lepton have been measured assuming lepton universality inZ0 decays. The inclusive branching fractions for the t decay into one, three, and five charged particles have been determined to be (85.45±0.97)%, (14.35±0.48)%, a...
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We have measured the branching ratios for several τ decay modes. We use e+e-→τ+τ- events accumulated with the TPC/Two-Gamma facility at the SLAC e+e- storage ring PEP. The data correspond to an integrated luminosity of 77 pb-1 at a center-of-mass energy of 29 GeV. The one- and three-charged-particle inclusive branching ratios of the τ decay are mea...
Article
The multiplicities per event of π± and K± are measured separately for e+e- annihilation into c, b, and light quark pairs at Ecm=29 GeV. The K± multiplicity is higher for heavy quark events than for light quark events. The π± multiplicity and the π± scaled differential cross section at low x=Ebeam/Ebeam are found to be higher for b events than for o...
Article
We compare the pT dependence of pion, kaon and proton production cross sections in the central rapidity region in e+e− annihilation events and in proton-proton collisions at ISR energies. We find similarities both in the pT dependence of cross sections and in the particle composition as a function of pT, in agreement with the hypothesis of a univer...
Article
We present a measurement of the photon structure functionF 2γ in the reactionee→eeX forQ 2 in the range 0.2<Q 2<7 GeV2, using 9,200 multihadron events obtained with the TPC/Two-Gamma detector at PEP. The data have been corrected for detector effects using a regularized unfolding procedure and are presented as a function ofx andQ 2. The structure fu...
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We report measurements of two-particle correlations in rapidity space between a p¯ or Lambda¯ and an additional p, p¯, Lambda, or Lambda¯. We find evidence for local conservation of baryon number, and for the first time observe a pronounced anticorrelation between baryons with the same value of baryon number. Such an anticorrelation is expected in...
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We report on the first search with virtual photon-photon collisions for narrow, neutral resonances with even C parity in the mass range 4.5e +e-R with both the scattered e+ and e- detected. We find upper limits (95% confidence level) for the partial decay width of a resonance into two photons, ranging from 50 keV at W=4.5 GeV to 10 MeV at W=19 GeV....
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Two-photon production of K08K+/-pi-/+ states has been studied by the TPC/Two-Gamma experiment at the SLAC storage ring PEP. A resonance of mass 1.42 GeV was seen when one of the photons was quite virtual but not when both photons were nearly real. Production of a spin-1 meson, which cannot be made by two real photons, would fit these observations....
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We measure an inclusive branching fraction of (13.9 +- 2.0/sub -2.2//sup +1.9/)% for the decay tau⁻..--> nu../sub tau/..pi..⁻..pi..°+nh° (ngreater than or equal to1), where h° is a ..pi..° or an eta. The data sample, obtained with the time-projection chamber detector facility at the SLAC e/sup +/e⁻ storage ring PEP, corresponds to an inte...
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We report measurements of the two-photon processes e+e-e+e - and e+e-e+e-K+K-, at an e+e- center-of-mass energy of 29 GeV. In the - data a high-statistics analysis of the f(1270) results in a width (f)=3.20.4 keV. The - continuum below the f mass is well described by a QED Born approximation, whereas above the f mass it is consistent with a QCD-mod...
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By observing the reaction ..gamma gamma -->..K-italic/sub s-italic/°K/sup +-/..pi../sup minus-or-plus/, the TPC/Two-Gamma experiment at the SLAC e-italic/sup +/e⁻ storage ring PEP has obtained a 95%-confidence-level limit of GAMMA/sub iota//sub ..-->..//sub ..gamma..//sub ..gamma../B(iota..-->..KK-bar..pi..)..//sub ..gamma..//sub ..gamma../ limi...
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We compare the particle flow in the event plane of three-jet qq¯g (quark-antiquark-gluon) events with the particle flow in radiative annihilation events qq¯γ (quark-antiquark-photon) for similar kinematic configurations. In the angular region between quark and antiquark jet, we find a significant decrease in particle density for qq¯g as compared to...
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We study long-range correlations between hadrons in opposite jets ine + e – annihilation events at Ös\sqrt s =29 GeV. We use the data to measure differences between quark and antiquark fragmentation functions into charged hadrons, and to estimate the variation of fragmentation properties among quark flavors. We find large variations in longitudina...
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We use the time-projection chamber detector to study mechanisms of baryon production in the central rapidity region of jets from e+e- annihilation. On the basis of angular correlations between protons and antiprotons, we exclude the isotropic decay of heavy mesonic clusters as a dominant source of baryons at 95% confidence level. The diquark mechan...
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We report a measurement of the reaction gammagamma-->K+K-pi+pi- in both tagged and untagged events at PEP. The cross section rises with invariant gammagamma mass to about 15 nb at 2 GeV and falls slowly at higher masses. We find clear evidence for the processes gammagamma-->phipi+pi- and gammagamma-->K*0(892)Kpi. Upper limits (95% C.L.) of 1.5 and...
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We have studied the production of prompt muons in hadronic events from e+e- annihilation at a center-of-mass energy of 29 GeV with the PEP4-TPC (Time Projection Chamber) detector. The muon p and pt distributions are well described by a combination of bottom- and charm-quark decays, with fitted semimuonic branching fractions of (15.2+/-1.9+/-1.2)% a...
Article
Inclusive production cross sections for photons and 0's ine + e – annihilation at a center of mass energy of 29 GeV have been measured. The 0 production spectrum agrees with a corresponding measurement for . The ratio of the 0 inclusive rate to the average for is 0.920.14. The fractions of the total energy carried by photons and 0's are 0.2440.016...
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Precise results are reported for the tau-lepton lifetime and several tau branching ratios obtained with the MAC detector operating at PEP at &surd;s =29 GeV. We find tautau=(3.15+/-0.36+/-0.4)×10 -13 sec. Results for the topological branching ratios B1, B3, B5 (tau decaying into 1, 3, 5 charged particles) are B3≡1-B1=0.133+/-0.003+/-0 .006 and B5
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We report a high-precision measurement of the ratio R of the total cross section for e+e--->hadrons to that for e+e--->mu+mu-, at a center-of-mass energy of 29.0 GeV using the MAC detector. The result is R=3.96+/-0.09. This value of R is used to determine a value of the strong coupling constant alphas of 0.23+/-0.06, nearly independent of fragmenta...
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A high-statistics measurement is presented of the cross section for the process e/sup +/e/sup -/..-->..tau/sup +/tau/sup -/ at ..sqrt..s = 29 GeV from the MAC detector at PEP. A fit to the angular distribution of our sample of 10 153 events with Vertical BarcosthetaVertical Bar<0.9 gives an asymmetry A/sub tautau/ = -0.055 +- 0.012 +- 0.005 from wh...
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A search in e+e- annihilation for final states which contain only a single energetic photon has been performed at s=29 GeV with the MAC detector at PEP. The upper limit on an anomalous signal has been interpreted in terms of mass limits for supersymmetric particles under the assumption of radiative pair production of either supersymmetric photons o...
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Bose-Einstein correlations between like-sign pions have been investigated in e/sup +/e/sup -/ annihilation at ..sqrt..s = 29 GeV using the Time Projection Chamber detector at the SLAC e/sup +/e/sup -/ storage ring PEP. The production rate of like-sign pion pairs with small relative momentum is found to be increased by more than 50% over the rate ex...
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Three currently used fragmentation models are tested by studying the distribution of particles between jet axes in the 3-jet events ofe +e − annihilation, using data collected by the Time Projection Chamber at PEP. These three models — the Lund String model, the Webber Cluster model and an Independent Fragmentation model (IF) — each implement diffe...
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Direct photon production in hadronic events from e+e- annihilation has been studied at &surd;s =29 GeV with use of the MAC detector at the PEP storage ring. A charge asymmetry A=(-12.3+/-3.5)% is observed in the final-state jets. The cross section and the charge asymmetry are in good agreement with the predictions of the fractionally charged quark-...
Article
Evidence for a narrow state decaying into an F meson and a photon has been obtained in e/sup +/e/sup -/ annihilation events at 29 GeV c.m. energy. This state lies 139.5 +- 8.3(stat) +- 9.7(syst) MeV above the F-meson mass and is consistent with the expected F( meson. The F mesons are identified by a peak in the K/sup +/K/sup -/..pi../sup + -/ mass...
Article
A measurement of the cross section for production of collinear muon pairs based upon a sample of about 3000 events observed in the MAC detector at the storage ring PEP is presented. From the angular asymmetry Amumu=0.076+/-0.018 the axial-vector weak neutral coupling is found to be given by gAegAmu=0.31+/-0.08.