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Participants were included in the analysis if they had complete data on variables relevant to the analysis for the baseline visit and at least one follow-up visit.
An additional 39 schools were excluded due to large amounts of missing data on variables needed for the matching procedures.
We will assume that missing data on variables in common to both PISA or TALIS are at least MAR.
The objective of this study was to prospectively collect data on variables involved in Emergency Department overcrowding (EMDOC) using an Internet-based data entry model.
Data on variables were collected at baseline and after 12 weeks of the study, which was completed by 46 women (mean age, 56.0 ± 7.0 y).
Two-phase sampling is typically used when it is very expensive to collect data on the variables of interest, but it is relatively inexpensive to collect data on variables that are correlated with the variables of interest.
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Those with missing data on one variable were classified based on the other.
Data on control variables, sociodemographic variables and health are presented in Table 1.
We will collect data on these variables to get more insight in possible variability between children.
We also drop observations with missing data on the variables of interest.
Data on these variables come from registers covering the entire Swedish population of males.
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