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The American Community Survey, a yearly demographic survey conducted by the US Census Bureau (16 ), was used to calculate population denominators for occupational data.
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This suggests that while death certificates may not be a suitable source of occupational data where classification into specific job titles is essential, in the absence of other data, it is a reasonable source for constructing measures such as occupational SES that are based on grouped occupational data.
Two cases and three controls with missing occupational data for all relevant time periods were excluded, leaving 109 cases and 253 controls in the present analysis.
According to occupational data for the Hellenic population of Western Greece during 2007 2009 (provided by the Hellenic Statistical Authority), persons occupied with agricultural activities constituted 21%%, i.e., smaller than half of what we found.
A case control study of paternal occupational data for 2920 cases of neuroblastoma, born and diagnosed in Great Britain between 1962 and 1999 and recorded in the National Registry of Childhood Tumours, and 2920 controls from the general population matched on sex, date of birth and birth registration district.
A substantial selection bias is unlikely since occupational data were complete for all participants, and the participation rate in this population survey was relatively high (69% for the vast majority of the county).
Examining regional variation at this subprovincial level is appropriate for occupational health data as labour markets are significantly shaped by geography [ 38].
Personal and occupational data were collected by questionnaire for 668 housekeepers, 1454 nursing assistants and 349 nurses.
Occupational data allowing differentiation of health workers are available for 18 countries through this source [ 30].
The cancer registry does not collect occupational data, thus it was not possible to adjust for such potential confounding.
However, our findings suggest that they may be a reasonable source for measures such as occupational socioeconomic status that are based on grouped occupational data.
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