Secondary endpoints were hospitalization due to infections and the progression of atherosclerotic process based on a composite of variables of the carotid arteries: intima media thickness (IMT), number, and structure of plaques.
Socio-economic strata were based on a composite of variables comprising the Australian SEIFA index [ 17].
Poverty is best identified by a composite of variables rather than one or a few simple (monetary) variables [ 8, 30, 31].
The wealth measure reflects a composite of several variables of ownership of household assets (bed, bicycle, blanket, lamp, watch) and one ordinal variable of household wall material.
Given the wealth index is a composite of several variables, as discussed before, it is difficult to interpret wealth effects in terms of specific interventions or policies.
The premature infants included in this multicenter PINT trial were analyzed at 18-21 months CA with regard to mortality, cerebral palsy, severe visual impairment, hearing-loss, a Bayley- Mental Developmental Index (MDI) score <70, and a composite of these variables.
Scores of material deprivation were based on a composite of three variables (average individual income, proportion of people without high school diploma (population ages 20+) and unemployment rate (population ages 25+)).
The Index of Relative Socio-Economic Advantage and Disadvantage utilised was derived from a composite of census variables reflecting advantage and disadvantage (e.g. households with low incomes and people with tertiary education).
Socio-economic status measurement is an ongoing problem, where different studies had been made to measure it as a single measured variable, several single measured variables, or as a composite of several measured variables.
This was based on each episode of care and was a composite of the national variable cost per day (for the year in which the surgery was performed) adjusted for the patient's own length of stay plus the estimated total cost of the Exeter implant and other components added as the fixed cost element.
The SES measure reflects a composite of five dummy variables of ownership of household assets and one ordinal variable of household wall material (Table 2).
