Table 2. Baseline Characteristics of Patients with ECG bON and bOFF Methadone.

Characteristic N = 211	ECG on Methadone	ECG off Methadone	P
Age at time of ECG, years (SD)	47.6 (9.7)	46.5 (10.0)	NS
Male (%)	57.4	57.4	--
Race (%)			--
Caucasian	46.5	--
African American	37.4	--
Asian	5.2	--
Other	10.9	--
ECG Setting (%)			NS
Emergency department	64.0	66.4
Inpatient	22.3	24.2
Outpatient	13.7	9.5
QTc, msec (SD)	440 (35)	429 (34)	<0.001
QTc ≥ 500 msec (%)	10 (4.8)	4 (1.9)	NS
Dose, mg (range) (SD)*	74.5 (15-140) (26.5)	--	--

^*Dose data missing in 15 patients