Population mixing and the incidence of childhood leukaemias: retrospective comparison in rural areas of New Zealand

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Abstract
Forestry developments, including the building of a pulp and paper mill, occurred in the adjacent Rotorua, Matamata, and Whakatane areas of New Zealand's North Island in the 1950s. These developments led to population growth and the establishment of the new towns of Kawerau and Murupara. In this study boundaries were defined for the Rotorua, Matamata, and Whakatane areas (study areas) based on local government divisions. Care was taken to ensure that the areas remained as equivalent as possible over the years. The population of the combined study areas increased greatly at the time of the forestry developments compared with a smaller increase in the rest of New Zealand (fig 1). Similar increases occurred in each individual area (Rotorua, Matamata, and Whakatane).

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