Are based upon the existence of a common characteristic such as predisposition to certain disease or medical condition, after concomitant use of some synthetic hormones, within a subgroup of a population that you want to study. People with the common characteristics are studied over a period of time to collect the information of interest to you. Examples; A study on development of uterine fibroids in women utilizing injectable contraceptives. Studies on active smokers and possible development of lung cancer.
CONTROL DESIGNS CROSS OVER CONTROL RANDOM DESIGN REFERENCE HOME PAGE
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