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Health
A state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity.
Health Indicator
A measure that reflects, or indicates, the state of health of persons in a defined population, e.g.
Health Information System
A combination of health statistics from various sources, used to derive information about health status, health care, provision and use of services, and impact on health.
High-Risk Group
A group in the community with an elevated risk of disease.
Histogram
A graphic representation of the frequency distribution of a continuous variable. Rectangles are drawn in such a way that their bases lie on a linear scale representing different intervals, and their heights are proportional to the frequencies of the value
Host
A person or other living organism that can be infected by an infectious agent under natural conditions.
Host Factor
An intrinsic factor (age, race, sex, behaviors, etc.) which influences an individual's exposure, susceptibility, or response to a causative agent.
Hyperendemic Disease
A disease that is constantly present at a high incidence and/or prevalence rate.
Hypothesis
A supposition, arrived at from observation or reflection, that leads to refutable predictions. Any conjecture cast in a form that will allow it to be tested and refuted.
Hypothesis, Alternative
The hypothesis, to be adopted if the null hypothesis proves implausible, in which exposure is associated with disease.
Hypothesis, Null
The first step in testing for statistical significance in which it is assumed that the exposure is not related to disease.
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