Plot of ΔΔQTcI vs. plasma atomoxetine and moxifloxacin concentrations following 7 days of atomoxetine (20 mg twice daily or 60 mg twice daily) and a single 400 mg dose of moxifloxacin. , Atomoxetine least-squares mean; , Moxifloxacin least-squares mean; , atomoxetine 90% lower bound; , moxifloxacin 90% lower bound; , atomoxetine 90% upper bound; , moxifloxacin 90% upper bound