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A null value can indicate which of the following conditions?
Schizophrenia
A long-term mental disorder involving a breakdown in the relation between thought, emotion, and behavior, leading to faulty perception and inappropriate actions.
Anorexia Nervosa
An eating disorder characterized by an obsessive fear of gaining weight, leading to severe restriction of food intake and malnourishment.
Physical Activity
Any bodily movement produced by skeletal muscles that requires energy expenditure, including activities undertaken while working, playing, carrying out household chores, traveling, and engaging in recreational pursuits.
Appetites
Natural desires or cravings, especially for food or pleasure.
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