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e. Cells with zero values were corrected to the nearest 0.1 standard deviation (occasionally, a value was found to be zero in the original file after editing, indicating that the value had been rounded to zero and could not be guaranteed to be at zero).
We described relationships within our sample in terms of the core set of family variables, plus other demographic, household, and individual level variables. However, these relationships must be considered in the context of the HBSC's administrative and organizational structure, and the nature of the data collection.
As with version 12, the 2009 data collection used a newly implemented system for data collection and management. The 2009 data collection employed a new instrument design, a new computerized instrument, and a new version of the HBSC International Core Questionnaires. The new system is called ISS, for International Study System. The HBSC International Core Questionnaires form the backbone of the HBSC system from which the international versions are derived. The HBSC International Core Questionnaires consist of 43 questions divided into four core components: Demographic Characteristics and Living Conditions; Health Status and Access to National Health Services; Behaviors; and School and Home Life.
This is an important and relevant question, but it is also one of the most difficult ones to answer accurately. In the same way, HBSC also attempts to provide the maximum amount of biological information within the smallest possible data collection system. The system allows for feedback throughout the entire process of data collection from quality assurance, security, panel management, questionnaire design, questionnaires to the data cleaning and cleaning of the data on which we base our analytic and reporting
Data are measured directly on respondents. The data collection and administration are designed to avoid reliance on memory of the respondents, but all respondents are asked to provide their date of birth. Respondents' birth dates are imputed by HBSC from data provided in countries where birth records are kept. d2c66b5586