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For compositional variables, we included age groups, with the youngest age group as the reference; race or ethnicity, with whites as the reference; disability or dual eligibility status (to reflect more vulnerable populations); and degree to which the study population had recently changed residence.
The up-to-date immunization coverage across all included age groups was 85% in our study.
Chi-square was used to show any difference in categorical data which included age groups, referring department, cause of condition and type of mechanical ventilation.
Sociodemographic characteristics included age groups according to quintiles (18 25, 26 35, 36 45 and 46 64 years of age), and marital status (married or unmarried).
In models for all types of leukaemia and lymphoma (both sexes and separately for men and women), and for ALL, AML and NHL, we also included age groups.
The final models included the following variables: study phase; year of registration; sexes included; age groups included; and source of funding.
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For both, a multivariable-adjusted model was fit that included age group, gender, race/ethnicity, family income and smoking status.
Variables of interest included age group, sex, and the geographical area of residence at the time of hospitalization (rural, urban, north).
The final model included age group, ethnic group and sex, vaccination history, chronic illness, and reported damp housing as independent variables.
The final model included age group, ethnic group, sex, vaccination history, chronic illness, reported damp housing, and study area as explanatory variables, with 2009 H1N1 seroprotective result as the outcome.
Adjusted prevalence rates were derived from a model that included age group as a co-variate.
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