2018 Index of Multiple Deprivation

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The 2018 New Zealand Index of Multiple Deprivation (IMD18) is a set of tools for identifying concentrations of deprivation in New Zealand. The IMD18 comprises 29 indicators grouped into seven domains of deprivation: Employment, Income, Crime, Housing, Health, Education and Access to services. IMD18 is the combination of these seven domains, which may be used individually or combined. The same methods used for IMD13 were used in 2018, however, we added two indicators (household dampness and household amenities) to the Housing Domain. Figure 1 shows the 2018 IMD’s 29 indicators and seven domains. The 2018 New Zealand Index of Multiple Deprivation was funded by the Auckland Medical Research Foundation. IMD18 measures deprivation at the neighbourhood level in custom-designed 2018 data zones that have an average population of 761. Data zones are designed to produce better small area information without losing their contents to suppression or confidentiality. The New Zealand land mass was divided into 6,181 data zones (DZ) in 2018, which mostly nest within 2013 data zone boundaries. Some of the 2013 data zones had low populations in 2018, so were merged with adjacent areas, while those areas that experienced a population increase between 2013 and 2018 were split to maintain relatively consistent populations. No 2018 meshblocks were split. Combining was not possible for 49 data zones with very low populations (ranging from 399 to 499) due to unsuitable neighbouring data zones, and splitting was not possible for 2 data zones with very high populations (1272 and 1284). On average, there are 8.55 meshblocks per data zone.


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