Andrea has been experiencing low mood, low energy, and significant weight gain for the last 2 months. She visits three mental health professionals, and each one diagnoses her with Major Depressive Disorder. In actuality, she has a glandular condition called hypothyroidism which causes the same symptoms, but is not caused by a mental disorder. Andrea's experience with the three professionals represents

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Andrea's experience with the three professionals suggests high reliability (consistency of diagnosis) but low validity (accuracy of diagnosis) because all three professionals arrived at the same diagnosis of Major Depressive Disorder despite the presence of physical symptoms that could also explain her condition.

Andrea Has Been Experiencing Low Mood, Low Energy, and Significant