Number of QT drugs 0 1 2 3 4 p-value Number of patients 97 117 30 12 3    Prolonged >500 ms (%) 20 (21) 11 (9) 10 (33) 4 (33) 2 (66)   QTc duration± SD, ms 464± 43 454± 39 483± 47 456± 42 519± 41 0.009

Table 2b: QTc duration in patients grouped depending on the number of QTc interval prolonging drugs administered.