School of Population Health

Auckland Region Vascular Atlas

The Auckland Region Vascular Atlas project integrates methods from epidemiology and geography to investigate and visualise the provision of vascular disease services (community laboratory tests, pharmaceutical management and hospital procedures) for the Auckland Region. The distribution of services will be illustrated across the region using socio-demographic and spatial factors. This research has significance for the evaluation of equity and quality of health service provision for population groups within the Auckland Region and has particular significance for Māori who suffer disproportionately the burden of vascular diseases. We have developed maps and reports for vascular disease screening, monitoring, treatment and burden of disease in the Auckland Region. These analyses were made possible by the improved quality of routinely collected health databases in New Zealand, enabling an individual’s health service records to be anonymously linked. The project is funded by the Auckland Medical Research Foundation.

Interactive maps available

To date we have mapped variations in diabetes, lipid testing, CVD medication dispensing, CVD prevalence and CVD mortality. We have also explored different approaches to mapping and displaying/visualising these indicators. The table below outlines the maps available for each indicator, and provides a brief description of the datasets used in the analyses.

Indicator Map type  / Template Description
Diabetes Prevalence

Single map

The prevalence of diabetes was calculated for the population aged 30 years and above who were registered with a Primary Health Organisation on 1 July 2011. In this study, a patient’s diabetes status was defined fromm diabetes inpatient events (ICD9: 250 [diabetes]; ICD10 E10 to E14 [Diabetes mellitus] and O240,O241,O242,O243 [Diabetes mellitus in pregnancy]): and dispensed pharmaceuticals where the Therapeutic group 2 = diabetes. The aim of this indicator was to show socio-demographic variations in diabetes across the Auckland Region.  

CVD Prevalence Single map

The prevalence of CVD was calculated for the population aged 30 years and older who were registered with a Primary Healthcare Organisation (PHO) on 1st July 2011 . In this study, a patient's CVD status was defined from CVD inpatient events (codes from grant) and dispensed pharmaceuticals where patients received statins, antiplatelets/anticoagulants and/or blood pressure lowering agents. The aim of this indicator is to show the geographical variations in the prevalence of CVD in the Auckland Region by age and gender.  

CVD Mortality Single map

Deaths due to cardiovascular disease in 2007-2008 were identified for those patients aged 30+ years, usually resident in the Auckland region and registered with a Primary Healthcare Organisation (PHO) in 2007 or 2008. CVD deaths were extracted from the National Mortality Collection using ICD codes version 9 and version 10, and included deaths where CVD was the primary or contributing cause of death. This indicator demonstrates considerable geographical disparities in CVD mortality for the total population and by age.  

CVD Medications Dispensed

Single map

NZ CVD guidelines recommend that the management of patients who have had an ischaemic heart event (get from commentary) should consist of statin, blood pressure lowering (BPL), and antiplatelet/anticoagulant medications, unless contra-indicated. In this study, the denominator is all patients aged 30-79 years who were survivors of an ischaemic event in 2000-2010, while the numerator is those patients that were dispensed a statin, BPL and/or antiplatelet/anticoagulant in at least 3 of the 4 calendar quarters of 2011. This indicator is important as it demonstrates that while the number of patients receiving the recommended drug therapy is considerably lower than might be expected, there is evidence of significant treatment differences by General Electoral District.  

Double map
Radar chart
Lipid Testing

Single Map

Lipid tests are used routinely in primary care to measure a patient’s cholesterol levels. In this study, the proportion of the population with CVD who had at least one lipid test per year in 2006-2011 was calculated. First, all people aged 30+ years who were registered with a Primary Health Organisation for each calendar quarter of the years 2006-2010 were identified. Then those people with a history of CVD were identified using inpatient events (hospitalisations) and pharmaceutical dispensing data. A patient was considered to have had a lipid test if a blood lipid series was registered in the laboratory claims dataset. This study highlights the variations in lipid testing per year, by age, gender, ethnicity and area-level deprivation.  

Online Atlas user guides

The interactive online atlas allows users to create different maps depending on what data they would like to display. For a short demonstration of the basic interface and controls for the interactive online atlas, see this Youtube video. For more information about the types of maps that can be created and how to use them, see the user guides and video tutorials below and the Online Atlas map comparison table

Single and double map

User guide Video demonstration (single)
Video demonstration (double)

Radar map

User guide Video demonstration

Performance analaysis map

User guide Video demonstration

Ring Map

 User guide Video demonstration