PD cases were confirmed through specific PD reported medications according to the NHANES database. In this way, patients reporting the use of Benztropine, Carbidopa, Levodopa, Ropinirole, Methyldopa, Entacapone, Cabergoline, Orphenadrine and Pramipexole were categorized as PD cases [30 (link),31 (link)]. Then, we divided participants as PD cases according to secure PD medication (Benztropine, Carbidopa, Levodopa, Ropinirole, Methyldopa and Entacapone) [30 (link),31 (link)] and unsecure PD medication (Cabergoline, Orphenadrine and Pramipexole) [30 (link),31 (link),32 (link),33 (link),34 (link)]. The unsecure PD group was defined because Cabergoline is used to treat high levels of prolactin hormone [32 (link)], Orphenadrine is used to treat muscle spasms in musculoskeletal conditions [33 (link)] and Pramipexole is also used to treat restless legs syndrome (RLS) [34 (link)].
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