Development and Standardization of an Osteoradionecrosis Classification System in Head and Neck Cancer: Implementation of a Risk-Based Model.

PURPOSE: Osteoradionecrosis of the jaw (ORN) can manifest in varying severity. The aim of this study is to identify ORN risk factors and develop a novel classification to depict the severity of ORN. METHODS: Consecutive patients with head and neck cancer (HNC) treated with curative-intent intensity-modulated radiation therapy (IMRT) (≥45 Gy) from 2011 to 2017 were included. Occurrence of ORN was identified from in-house prospective dental and clinical databases and charts. Multivariable logistic regression model was used to identify risk factors and stratify patients into high-risk and low-risk groups. A novel ORN classification system was developed to depict ORN severity by modifying existing systems and incorporating expert opinion. The performance of the novel system was compared with 15 existing systems for their ability to identify and predict serious ORN event (jaw fracture or requiring jaw resection). RESULTS: ORN was identified in 219 of 2,732 (8%) consecutive patients with HNC. Factors associated with high risk of ORN were oral cavity or oropharyngeal primaries, received IMRT dose ≥60 Gy, current/ex-smokers, and/or stage III to IV periodontal condition. The ORN rate for high-risk versus low-risk patients was 12.7% versus 3.1% (P < .001) with an AUC of 0.71. Existing ORN systems overclassified serious ORN events and failed to recognize maxillary ORN. A novel ORN classification system, ClinRad, was proposed on the basis of vertical extent of bone necrosis and presence/absence of exposed bone/fistula. This system detected serious ORN events in 5.7% of patients and statistically outperformed existing systems. CONCLUSION: We identified risk factors for ORN and proposed a novel ORN classification system on the basis of vertical extent of bone necrosis and presence/absence of exposed bone/fistula. It outperformed existing systems in depicting the seriousness of ORN and may facilitate clinical care and clinical trials.

Development and Standardization of a Classification System for Osteoradionecrosis: Implementation of a Risk-Based Model.

Purpose: Osteoradionecrosis of the jaw (ORN) can manifest in varying severity. The aim of this study is to identify ORN risk factors and develop a novel classification to depict the severity of ORN. Methods: Consecutive head-and-neck cancer (HNC) patients treated with curative-intent IMRT (≥ 45Gy) in 2011-2018 were included. Occurrence of ORN was identified from in-house prospective dental and clinical databases and charts. Multivariable logistic regression model was used to identify risk factors and stratify patients into high-risk and low-risk groups. A novel ORN classification system was developed to depict ORN severity by modifying existing systems and incorporating expert opinion. The performance of the novel system was compared to fifteen existing systems for their ability to identify and predict serious ORN event (jaw fracture or requiring jaw resection). Results: ORN was identified in 219 out of 2732 (8%) consecutive HNC patients. Factors associated with high-risk of ORN were: oral-cavity or oropharyngeal primaries, received IMRT dose ≥60Gy, current/ex-smokers, and/or stage III-IV periodontal disease. The ORN rate for high-risk vs low-risk patients was 12.7% vs 3.1% (p<0.001) with an area-under-the-receiver-operating-curve (AUC) of 0.71. Existing ORN systems overclassified serious ORN events and failed to recognize maxillary ORN. A novel ORN classification system, RadORN, was proposed based on vertical extent of bone necrosis and presence/absence of exposed bone/fistula. This system detected serious ORN events in 5.7% of patients and statistically outperformed existing systems. Conclusion: We identified risk factors for ORN, and proposed a novel ORN classification system based on vertical extent of bone necrosis and presence/absence of exposed bone/fistula. It outperformed existing systems in depicting the seriousness of ORN, and may facilitate clinical care and clinical trials.

Consent and widespread access to personal health information for the delivery of care: a large scale telephone survey of consumers' attitudes using vignettes in New Zealand.

OBJECTIVES: In light of recent health policy, to examine factors which influence the public's willingness to consent to share their health information in a national electronic health record (EHR). DESIGN: Data were collected in a national telephone survey in 2008. Respondents were presented with vignettes that described situations in which their health information was shared and asked if they would consent to such sharing. The subset, consisting of the 18 vignettes that covered proving care, was reanalysed in depth using new statistical methods in 2016. SETTING: Adult population of New Zealand accessible by telephone landline. PARTICIPANTS: 4209 adults aged 18+ years in the full data set, 2438 of which are included in the selected subset. MAIN OUTCOME MEASURES: For each of 18 vignettes, we measured the percentage of respondents who would consent for their information to be shared for 2 groups; for those who did not consider that their records contained sensitive information, and for those who did or refused to say. RESULTS: Rates of consent ranged from 89% (95% CI 87% to 92%) for sharing of information with hospital doctors and nurses to 51% (47% to 55%) for government agencies. Mixed-effects logistic regression was used to identify factors which had significant impact on consent. The role of the recipient and the level of detail influenced respondents' willingness to consent (p<0.0001 for both factors). Of the individual characteristics, the biggest impact was that respondents whose records contain sensitive information (or who refused to answer) were less willing to consent (p<0.0001). CONCLUSIONS: A proportion of the population are reluctant to share their health information beyond doctors, nurses and paramedics, particularly when records contain sensitive information. These findings may have adverse implications for healthcare strategies based on widespread sharing of information. Further research is needed to understand and overcome peoples' ambivalence towards sharing their information.

Indigenous mortality (revealed): the invisible illuminated.

Inaccuracies in the identification of Indigenous status and the collection of and access to vital statistics data impede the strategic implementation of evidence-based public health initiatives to reduce avoidable deaths. The impact of colonization and subsequent government initiatives has been commonly observed among the Indigenous peoples of Australia, Canada, New Zealand, and the United States. The quality of Indigenous data that informs mortality statistics are similarly connected to these distal processes, which began with colonization. We discuss the methodological and technical challenges in measuring mortality for Indigenous populations within a historical and political context, and identify strategies for the accurate ascertainment and inclusion of Indigenous people in mortality statistics.

A comparison of cancer statistics in New Zealand and Australia: 1996-2007.

AIM: To compare the burden and outcomes of cancer in New Zealand with those in Australia. METHODS: For the years 1996-1997 and 2006-2007, the incidence and mortality of cancer in New Zealand and Australia was compared to determine if differences between the two countries had changed over the decade under study. Summarised cancer data from New Zealand and Australia, age standardised to the 2002 World Health Organisation's standard population, were used to make the comparisons. RESULTS: For the 11 year timeframe of this study, total rates of cancer incidence reduced in New Zealand and increased in Australia. The incidence of cancer in New Zealand, relative to Australia, changed from an excess of +10.3 to a deficit of -27.5 per 100,000 people. When considering the excess in terms of gender, the annual excess of cancer registrations for New Zealand females fell from +19.9 to +0.9 per 100,000, and male cancer registration fell from an excess of +3.7 to a deficit of -58.0 per 100,000, due almost entirely to a surge in prostate cancer registration in Australia. Over the same 11-year timeframe, cancer-specific mortality rates decreased in both countries, but there was no change in the difference between New Zealand and Australian rates, which remained 10% higher in New Zealand. Similar to findings on 1996/7 data, the main cancer sites responsible for the overall excess mortality in 2006/7 were colorectal cancer in both sexes, and lung and breast cancer in females. CONCLUSION: The persisting different cancer mortality rates between the two countries is likely to have been partly due to lifestyle and ethnic differences in the populations, and partly due to New Zealanders presenting with more advanced cancers and having less easy access to some treatments. Until we know the relative contributions of these factors, it will be difficult for New Zealand to plan interventions in the future which have a good chance of lifting our cancer survival rates to those of our closest neighbour. The collection of clinical stage on all new cancer registrations would provide the base information required.

New Zealanders' attitudes towards access to their electronic health records: preliminary results from a national study using vignettes.

This project investigates public attitudes towards sharing confidential personal health information held in electronic health records (EHRs). The project uses computer assisted telephone interviewing (CATI) to conduct a quantitative national survey of the attitudes of New Zealanders towards access to their personal health information using vignettes. Respondents are presented with vignettes which describe ways in which their health information might be used, and asked about their attitude to and consent for each type of access. The project outcome will be a specification of requirements for an e-consent model meeting the needs of most New Zealanders, thus enabling the potential benefits of electronically sharing confidential health information from EHRs. This article presents preliminary results from the first 1828 respondents. Respondents were most willing to share their information for the purpose of providing care. However, removing their name and address greatly increased the acceptability of sharing information for other purposes.

Barriers to best outcomes in breastfeeding for Maori: mothers' perceptions, whanau perceptions, and services.

This research explores the perceptions of New Zealand Maori women and their whanau (customary Maori extended family) toward barriers to achieving best outcomes in infant feeding: exclusively breastfed infants at 6 months. Interviews are undertaken with 59 Maori women who have given birth in the previous 3 years and 27 whanau members. Although mothers and whanau members feel positively toward breastfeeding and generally expect to breastfeed exclusively, these expectations are unmet in many cases because of lack of support when establishing breastfeeding; lack of support when life circumstances change; lack of timely, culturally relevant, and comprehensible information; confusion about smoking while breastfeeding; uncertainty about the safety of bed-sharing, and perceived lack of acceptability of breastfeeding in public. The relatively high rates of tobacco use by Maori create a tension for breastfeeding mothers, cited by some as a reason for ending breastfeeding prematurely.

Influences that affect Maori women breastfeeding.

This project aimed to identify the factors that influence Maori women's decision to breastfeed or not. During 2004-2005, a diverse demographic of Maori women and family members was selectively recruited from within a major urban area, small towns, and rural areas. Thirty women who had cared for a newborn within the previous three years were interviewed, alone or together with other family members. All participants self-identified as Maori and were over 16. Women who had artificially fed their babies were underrepresented. Most of the participants had breastfed and their determination to breastfeed was strong. This research proposes a new model for understanding how Maori women are diverted from breastfeeding. Five influences were identified: interruption to a breastfeeding culture; difficulty establishing breastfeeding within the first six weeks; poor or insufficient professional support; perception of inadequate milk supply; and returning to work. These influences occur in a temporal sequence and highlight opportunities for intervention. Factors that encourage breastfeeding are also discussed.

Oranga Kaumatua: perceptions of health in older Maori people.

This paper explores some of the opportunities for Maori health uncovered by recent developments in the measurement and analysis of health-related behaviours. Presented is a case study, the findings of a survey incorporating Short Form 36 (SF36) of more than 400 older Maori, many considered kaumatua'. The case study is a window through which we may observe and understand health-related behaviour, the notion of cultural norms and social values, and how health states may be interpreted. Oranga Kaumatua, finding health for "older Maori", is as much about what may be considered everyday (maori) as about what is unusual. The underlying difference or diversity in society may tell us what will most useful to measure. The findings identify important cross-links between health and other factors contributing to health, indicating that higher standards of health are strongly associated with active marae" participation, and cultural affiliation, home ownership, and higher incomes. Low income appears to be generally associated with poorer health, and it seems that older Maori may have less opportunity to supplement their income compared with other New Zealanders in the same age groups. In this paper, the risks and protective behaviour of the participants covered the breadth of the social policy sector, and underline the need for long-term policy planning. Provision for Maori retirement is a matter that iwi"', hapu" and the State should consider. Older Maori will continue to rely heavily on State provision. High home ownership is less likely among the next generation of older Maori, and many will have known long periods of unemployment. Long hours of voluntary work (on marae or among whanau") are not atypical, and there may be a case for recognising those efforts through a revised system of marae management. As dependency ratios change with a larger proportion of older people, policies should also be revised to assure that potential at both ends of the life cycle is fulfilled.