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d‐RA/d‐MPH metabolic ratio (MR) in relation to (A) d‐MPH C/D (r s = −0.37, p = 0.1, n = 21) and (B) l‐MPH C/D (r s = −0.56, p = 0.06, n = 12). For l‐MPH, data from the first study visit with a plasma concentration above the LLOQ are included. d‐RA/d‐MPH MR in subjects with l‐MPH < LLOQ are shown as X (n = 9). MPH, methylphenidate
