https://www.selleckchem.com/pr....oducts/kg-501-2-naph
The probability of "nearly every day" showed a reverse U-shaped pattern, in that it was low from 12-29 years, increased during 30-50 years, and then decreased at ≥60 years. The age-related change in the probability of a response of "nearly every day" coincided with the trajectory of the PHQ-9 total scores. This study demonstrated that item responses for the PHQ-9 followed a similar mathematical pattern across the adult lifespan. Moreover, our findings suggested that the probability of a response of "nearly every
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