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Factors influencing the risk of DAT deficit (≤65% age-expected DAT binding in lowest putamen); family hx of PD = one or more first-degree relatives with PD; constipation ≤1 bowel movement/d; subtle motor sx = endorsing ≥2 symptoms on the PD Symptom Rating Scale; RBD = endorsing any symptom more than once per month. DAT = dopamine transporter; PD = Parkinson disease; RBD = REM behavior disorder.
