Question

1. A study was conducted in children in rural Ghana to determine the measles incidence in children with or without a vitamin A supplementation. Between 1989 and 1991, all children six months or older were randomly assigned to receive a dose of vitamin A or a dose of placebo. Field workers visited children every four months, administered the corresponding dose, and collected data regarding the illness experienced by the child within the week prior to the visit, the child's weight, and any hospitalization or diagnosis of measles since the last visit. (8 points 2 each) Answer the following questions: a) what is the study design? b) what is exposure variable? c) what is outcome variable? d) what are advantages of the study design that was used (briefly in one sentence). Note: For study design, try to have as detailed specific design as possible and avoid a broad term such as 'experimental study' or 'observational study')

Answer 1