Survival Disparities in Indigenous and Non-Indigenous New Zealanders with Colon Cancer: The Role of Patient Comorbidity, Treatment and Health Service Factors

Sarah Hill, Diana Sarfati, Tony Blakely, Bridget Robson, Gordon Purdie, Jarvis Chen, Elizabeth Dennett, Donna Cormack, Ruth Cunningham, Kevin Dew, Tim McCreanor, Ichiro Kawachi

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Background Ethnic disparities in cancer survival have been documented in many populations and cancer types. The causes of these inequalities are not well understood but may include disease and patient characteristics, treatment differences and health service factors. Survival was compared in a cohort of Maori ( Indigenous) and non-Maori New Zealanders with colon cancer, and the contribution of demographics, disease characteristics, patient comorbidity, treatment and healthcare factors to survival disparities was assessed.

Methods Maori patients diagnosed as having colon cancer between 1996 and 2003 were identified from the New Zealand Cancer Registry and compared with a randomly selected sample of non-Maori patients. Clinical and outcome data were obtained from medical records, pathology reports and the national mortality database. Cancer-specific survival was examined using Kaplane-Meier survival curves and Cox hazards modelling with multivariable adjustment.

Results 301 Maori and 328 non-Maori patients with colon cancer were compared. Maori had a significantly poorer cancer survival than non-Maori ( hazard ratio (HR) 1.33, 95% CI 1.03 to 1.71) that was not explained by demographic or disease characteristics. The most important factors contributing to poorer survival in Maori were patient comorbidity and markers of healthcare access, each of which accounted for around a third of the survival disparity. The final model accounted for almost all the survival disparity between Maori and non-Maori patients ( HR 1.07, 95% CI 0.77 to 1.47).

Conclusion Higher patient comorbidity and poorer access and quality of cancer care are both important explanations for worse survival in Maori compared with non-Maori New Zealanders with colon cancer.
Original languageEnglish
Pages (from-to)117-123
Number of pages7
JournalJournal of Epidemiology & Community Health
Volume64
Issue number2
DOIs
Publication statusPublished - Feb 2010

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