Etiology (alternately "aetiology") is the study of causation. In medicine it specifically refers to the causation of diseases or pathologies. The term is also used in philosophy, physics and biology in reference to the causes of various phenomena.
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... out of which 41.5% have children under the age of 18 living with them, 70.9% are married couples living together, 7.3% have a female householder with no husband ...