Billingsley Kaambwa

Prof. Billingsley Kaambwa

orcid

Research Focus & Metrics

Academic Career Length

19Years (2008-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
1 July 2010 in The Lancet
Verified
Journal Article
Closed access
RMRichard J McManus
Richard J McManus
JMJonathan Mant
Jonathan Mant
EBEmma P Bray
Emma P Bray
RHRoger Holder
Roger Holder
MJMiren I Jones
Miren I Jones
FHFd Richard Hobbs
Fd Richard Hobbs

20 September 2016 in Health and Quality of Life Outcomes
Verified
Journal Article
Open access
PDF file
NMNikki McCaffrey
Nikki McCaffrey
Billingsley KaambwaBillingsley Kaambwa
Billingsley Kaambwa
DCDavid C. Currow
David C. Currow
JRJulie Ratcliffe
Julie Ratcliffe
Although a five level version of the widely-used EuroQol 5 dimensions (EQ-5D) instrument has been developed, population norms are not yet available for Australia to inform the future valuation of health in economic evaluations. The aim of this study was to estimate HrQOL normative values for the EQ-5D-5L preference-based measure in a large, randomly selected, community sample in South Australia. The EQ-5D-5L instrument was included in the 2013 South Australian Health Omnibus Survey, an interviewer-administered, face-to-face, cross-sectional survey. Respondents rated their level of impairment across dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression) and global health rating on a visual analogue scale (EQ-VAS). Utility scores were derived using the newly-developed UK general population-based algorithm and relationships between utility and EQ-VAS scores and socio-demographic factors were also explored using multivariate regression analyses. Ultimately, 2,908 adults participated in the survey (63.4 % participation rate). The mean utility and EQ-VAS scores were 0.91 (95 CI 0.90, 0.91) and 78.55 (95 % CI 77.95, 79.15), respectively. Almost half of respondents reported no problems across all dimensions (42.8 %), whereas only 7.2 % rated their health >90 on the EQ-VAS (100 = the best health you can imagine). Younger age, male gender, longer duration of education, higher annual household income, employment and marriage/de facto relationships were all independent, statistically significant predictors of better health status (p < 0.01) measured with the EQ-VAS. Only age and employment status were associated with higher utility scores, indicating fundamental differences between these measures of health status. This is the first Australian study to apply the EQ-5D-5L in a large, community sample. Overall, findings are consistent with EQ-5D-5L utility and VAS scores reported for other countries and indicate that the majority of South Australian adults report themselves in full health. When valuing health in Australian economic evaluations, the utility population norms can be used to estimate HrQOL. More generally, the EQ-VAS score may be a better measure of population health given the smaller ceiling effect and broader coverage of HrQOL dimensions. Further research is recommended to update EQ-5D-5L population norms using the Australian general population specific scoring algorithm once this becomes publically available.

31 August 2020 in Supportive Care in Cancer
Verified
Journal Article
Open access
PDF file
FMFloortje Mols
Floortje Mols
BTBianca Tomalin
Bianca Tomalin
APAlison Pearce
Alison Pearce
Billingsley KaambwaBillingsley Kaambwa
Billingsley Kaambwa
BKBogda Koczwara
Bogda Koczwara
Background: Financial toxicity has traditionally been attributed to the rising costs of cancer care. As ability to work impacts one’s financial situation, limited employment and reduced income may also contribute to financial toxicity. We examined evidence of the association between financial toxicity and employment status in cancer survivors. Methods: A systematic literature review was performed via PubMed, Web of Science, CINAHL, and PsycINFO with search terms including “Cancer,” “Financial toxicity,” and “Employment” on September 25, 2019. Results: Thirty-one papers met eligibility criteria. Thirteen studies were rated as having high quality, 16 as adequate, and two as low. Being actively treated for cancer had serious negative consequences on employment and medical expenditures. Unemployment, changed or reduced employment, lost days at work, poor work ability, and changes to employment were associated with a higher risk of financial toxicity. Patients who were younger, non-white, unmarried, of low education, living with dependents, residing in non-metropolitan service areas, with lower income, and of low socioeconomic status were more at risk of financial toxicity. Other variables associated with financial toxicity included having a mortgage/personal loan, higher out of pocket costs and household bills, limited health insurance, more severely ill, on active treatment, and lower functioning or quality of life. Conclusion: Cancer negatively affects employment, and these changes are significant contributors to financial toxicity. Researchers, healthcare professionals, and patients themselves should all cooperate to tackle these complex issues.

24 October 2018 in Journal of Cancer Survivorship
Verified
Journal Article
Closed access
PDF file
APAlison Pearce
Alison Pearce
BTBianca Tomalin
Bianca Tomalin
Billingsley KaambwaBillingsley Kaambwa
Billingsley Kaambwa
NHNicole Horevoorts
Nicole Horevoorts
SDSaskia Duijts
Saskia Duijts
BKBogda Koczwara
Bogda Koczwara

22 September 2020 in JAMA
Verified
Journal Article
Closed access
PDF file
SMStuart MacKay
Stuart MacKay
ACA. Simon Carney
A. Simon Carney
PCPeter G. Catcheside
Peter G. Catcheside
CCChing Li Chai-Coetzer
Ching Li Chai-Coetzer
MCMichael Chia
Michael Chia
RMR. Doug McEvoy
R. Doug McEvoy
Quiz Ref ID Adult obstructive sleep apnea (OSA) is associated with numerous adverse effects if left untreated, including daytime sleepiness, reduced quality of life, increased cardiovascular morbidity and mortality, and an increased risk of motor vehicle crashes.1-3 Quiz Ref ID A narrow or unstable upper airway4 predisposes to episodes of complete or partial airflow reduction (ie, obstructive apnea or hypopnea) during sleep when pharyngeal dilator muscle tone falls. Continuous positive airway pressure (CPAP) delivered by mask, or jaw advancement with an oral appliance, can alleviate obstruction; however, many patients either refuse these therapies, use them inconsistently, or (as in the case of oral appliances) achieve suboptimal efficacy, leaving at least 50% of patients without effective treatment5,6 and exposed to the risk of serious long-term morbidity. Surgical treatments aim to enlarge and stabilize the upper airway and may provide an option for patients in whom conventional medical treatment had failed.7 However, to date, there have been few randomized trials evaluating the benefits and complications of these surgical procedures compared with controls,8-11 and most have tested surgical treatment at a single level of the upper airway in highly select patients.8,9,11

9 November 2015 in Health and Quality of Life Outcomes
Verified
Journal Article
Open access
PDF file
NBNorma Bulamu
Norma Bulamu
Billingsley KaambwaBillingsley Kaambwa
Billingsley Kaambwa
JRJulie Ratcliffe
Julie Ratcliffe
This paper describes the methods and results of a systematic review to identify instruments used to measure quality of life outcomes in older people. The primary focus of the review was to identify instruments suitable for application with older people within economic evaluations conducted in the aged care sector. Online databases searched were PubMed, Medline, Scopus, and Web of Science, PsycInfo, CINAHL, Embase and Informit. Studies that met the following criteria were included: 1) study population exclusively above 65 years of age 2) measured health status, health related quality of life or quality of life outcomes more broadly through use of an instrument developed for this purpose, 3) used a generic preference based instrument or an older person specific preference based or non-preference based instrument or both, and 4) published in journals in the English language after 2000. The most commonly applied generic preference based instrument in both the community and residential aged care context was the EuroQol - 5 Dimensions (EQ-5D), followed by the Adult Social Care Outcomes Toolkit (ASCOT) and the Health Utilities Index (HUI2/3). The most widely applied older person specific instrument was the ICEpop CAPability measure for Older people (ICECAP-O) in both community and residential aged care. In the absence of an ideal instrument for incorporating into economic evaluations in the aged care sector, this review recommends the use of a generic preference based measure of health related quality of life such as the EQ-5D to obtain quality adjusted life years, in combination with an instrument that has a broader quality of life focus like the ASCOT, which was designed specifically for evaluating interventions in social care or the ICECAP-O, a capability measure for older people.