Time frame: Part B, Periods 1 through 3: Baseline, 1 h, 1.5 h, 2 h, 3 h, 4 h, 6 h, 12 h, and 24 h postdose
The QT interval is a measure of the time between the start of the Q wave and the end of the T wave and is calculated from electrocardiogram (ECG) data. Corrected QT (QTc) is the QT interval corrected for heart rate and RR, which is the interval between 2 R waves. Using the population-corrected formula: QTcP = QT/RR^beta, where beta is the population correction factor computed from a log-linear model (ln) QT = alpha+beta*ln RR fitted to all Day -1 and Day 1 predose QT and RR measurements in all periods for all participants. Baseline is the average of data collected for 2 hours before dosing on Day 1 of each period [-2 hours (h), -1.5 h, -1 h, -0.5 h, and 0 h]. The QTcP interval was not assessed during Part A of the study, as specified in the protocol. The QTcP interval at 1 h, 2 h, and 4 h postdose for moxifloxacin was compared to placebo to establish assay sensitivity.