An example of is one in which a group of individuals who have a condition, such as heart disease, are compared with a similar group of people who do not have the same condition.

Patient

Explanation:

Those who go to the hospital with illness are referred to as patient and those who also go for check up even if they are not sick are also referred to as patient.

well, it depends. it is natural to not fall asleep before 11: 00 p.m. teens need about 8-10 hours of sleep each night to function best.

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