In addition to appliance use, we have also considered unperturbed E-fields external to the residence generated by nearby overhead high voltage electricity circuits.
The KHDSS registers two forms of migrations: external migration, where the residence changes between a residential unit in the HDSS and one outside it and internal migration, where residence changes from one residential unit to another within the HDSS area.
Nevertheless, we have analysed the unperturbed external field at the residence, as an individual factor for risk.
In the case of exposure to PFOA and PFOS in communities lacking distinctive environmental sources, as in these two studies, interindividual variation can result from specific sources of external exposure associated with residence, occupation, or lifestyle, or from all persons having similar, more or less random environmental exposures, but differing in uptake and excretion.
Both data sources contain information on age, sex, principal diagnosis, external cause and LGA of residence for all cases.
The first flow referred to SARS cases that resulted from the external flow from the permanent residence to onset location, which mainly occurred within a small range, within families and neighborhoods as the key spatial location of the SARS outbreak and person-to-person transmission.
Two measures of the external environment were included: region of residence [ 17], and urban/rural location or population density [ 18, 19].
For skin integument (iron residence about 40 days) such external information was not available.
To compare the total work-related radiation dose in our department of radiology with the dose in Dutch residences, taking x-ray radiation, external natural radiation and radon into account.
For receiving ANC and place of delivery, the external environment was represented by the area of residence (urban, rural).
