Longitudinal Study or research is a type of observational research (study) in which specific subjects (variables) are observed and data is gathered on them over a period of time. In this case, the subjects being observed are the premature children, the data collected on them are their intellectual growth and this research was carried out over the period of Eighteen (18) years.
These types of medical equipment are referred to as<u>"sharps"</u>. They are normally disposed of separately from the other used medical equipment to avoid accidental cuts.
