Variable Label (VAR)	Variable Name	Category	N(%)	N(Missing)	Mean(SD)	Median(Q1,Q3)	Range of Values	
A1. Blind_ID	BLIND_ID			523(0)	463.39(274.43)	452.00(214.00,709.00)	2.00-919.00	
								
A2. Study Visit	VISIT	Missing	5(1.0)					
								
		Study visit 9 (age 6 years)	260(49.7)					
								
		Study visit 66 (stage III (FONTAN))	258(49.3)					
								
A3. Patient's age (years) at 12-lead echo	PATIENT_AGE_ECHO12L			523(0)	4.50(1.69)	5.52(2.88,6.05)	0.86-7.00	
								
B1. Predominant rhythm	PRERHYTH	ATRIAL ESCAPE	15(2.9)					
								
		ECTOPIC ATRIAL	6(1.1)					
								
		JUNCTIONAL ESCAPE	16(3.1)					
								
		Missing	1(0.2)					
								
		NORMAL SINUS RHYTHM	431(82.4)					
								
		OTHER	26(5.0)					
								
		PACED	14(2.7)					
								
		SINUS BRADYCARDIA	13(2.5)					
								
		VENTRICULAR ESCAPE	1(0.2)					
								
B1a. If PACED, specify mode	PACED	AAI	2(0.4)					
								
		DDD	9(1.7)					
								
		OTHER	2(0.4)					
								
		Skipped	509(97.3)					
								
		VVI	1(0.2)					
								
B1a1. Specify other paced mode	PACEDOTH			()	()	(,)	-	
								
B1b. Specify other predominant rhythm	PRERHYTHSPEC			()	()	(,)	-	
								
B2a. Sinus arrhythmia	SINUS	Missing	3(0.6)					
								
		No	483(92.4)					
								
		Yes	37(7.1)					
								
B2b. Junctional escape beats	JUNCTION	Missing	3(0.6)					
								
		No	517(98.9)					
								
		Yes	3(0.6)					
								
B2e. Other rhythm	OTHERRHYTH	Missing	4(0.8)					
								
		No	501(95.8)					
								
		Yes	18(3.4)					
								
B2e1. Specify other rhythm	OTHERRHYTHSP			()	()	(,)	-	
								
C1. Atrial ectopy	ATRECTOPY	Missing	1(0.2)					
								
		No	511(97.7)					
								
		Yes	11(2.1)					
								
C1a. Atrial ectopy: Isolated	ATRISOLATED	Missing	1(0.2)					
								
		Skipped	511(97.7)					
								
		Yes	11(2.1)					
								
C1b. Atrial ectopy: Couplets	ATRCOUPLET	Missing	2(0.4)					
								
		No	9(1.7)					
								
		Skipped	511(97.7)					
								
		Yes	1(0.2)					
								
C1c. Atrial ectopy: Non-sustained tachyarrhythmia	ATRNSTACHY	Missing	1(0.2)					
								
		No	10(1.9)					
								
		Skipped	511(97.7)					
								
		Yes	1(0.2)					
								
C1c1. Atrial ectopy: Non-sustained tachyarrhythmia type	NSTACHYTYPE	ECTOPIC ATRIAL	1(0.2)					
								
		Missing	1(0.2)					
								
		Skipped	521(99.6)					
								
C1d. Atrial ectopy: Sustained tachyarrhythmia	ATRSTACHY	Missing	1(0.2)					
								
		No	11(2.1)					
								
		Skipped	511(97.7)					
								
C1d1. Atrial ectopy: Sustained tachyarrhythmia type	STACHYTYPE	Missing	1(0.2)					
								
		Skipped	522(99.8)					
								
C2. Ventricular ectopy	VECTOPY	Missing	1(0.2)					
								
		No	517(98.9)					
								
		Yes	5(1.0)					
								
C2a. Ventricular ectopy: isolated	VISOLATED	Missing	2(0.4)					
								
		No	2(0.4)					
								
		Skipped	517(98.9)					
								
		Yes	2(0.4)					
								
C2b. Ventricular ectopy: couplet	VCOUPLET	Missing	2(0.4)					
								
		No	3(0.6)					
								
		Skipped	517(98.9)					
								
		Yes	1(0.2)					
								
C2c. Ventricular ectopy: Non-sustained tachyarrhythmia	VNSTACHY	Missing	2(0.4)					
								
		No	2(0.4)					
								
		Skipped	517(98.9)					
								
		Yes	2(0.4)					
								
C2d. Ventricular ectopy: Sustained tachyarrhythmia	VSTACHY	Missing	2(0.4)					
								
		No	4(0.8)					
								
		Skipped	517(98.9)					
								
D1. Ventricular rate	VRATE			521(2)	96.83(21.13)	96.00(82.00,111.00)	50.00-163.00	
								
D2. PR interval	PRINTRVL			504(19)	137.76(31.47)	134.00(120.00,152.00)	20.00-360.00	
								
D3. QRS duration	QRSDURTN			521(2)	96.16(15.39)	94.00(86.00,104.00)	54.00-186.00	
								
D4. QT interval	QTINTRVL			519(4)	354.48(42.59)	350.00(322.00,380.00)	230.00-486.00	
								
D5. QTC interval	QTCINTRV			519(4)	441.83(31.86)	441.00(423.00,458.00)	298.00-621.00	
								
D6. P axis	PAXIS			508(15)	34.76(35.84)	38.00(14.00,56.00)	-135.00-265.00	
								
D7. R axis	RAXIS			522(1)	92.52(80.46)	101.00(73.00,127.00)	-175.00-268.00	
								
D8. T axis	TAXIS			521(2)	68.85(36.12)	74.00(55.00,90.00)	-102.00-264.00	
								
E1. Right bundle branch block	RBBB	Missing	4(0.8)					
								
		No	450(86.0)					
								
		Yes	69(13.2)					
								
E2. Left bundle branch block	LBBB	Missing	4(0.8)					
								
		No	515(98.5)					
								
		Yes	4(0.8)					
								
E3. Right atrial enlargement	RAE	Missing	4(0.8)					
								
		N/A	2(0.4)					
								
		No	409(78.2)					
								
		Yes	108(20.7)					
								
E4. Left atrial enlargement	LAE	Missing	3(0.6)					
								
		N/A	2(0.4)					
								
		No	477(91.2)					
								
		Yes	41(7.8)					
								
E5. Right ventricular hypertrophy	RVH	Missing	1(0.2)					
								
		N/A	2(0.4)					
								
		No	56(10.7)					
								
		Yes	464(88.7)					
								
E6. Left ventricular hypertrophy	LVH	Missing	1(0.2)					
								
		N/A	1(0.2)					
								
		No	493(94.3)					
								
		Yes	28(5.4)					
								
E7. Non-specific ventricular hypertrophy	NSVH	Missing	3(0.6)					
								
		N/A	1(0.2)					
								
		No	501(95.8)					
								
		Yes	18(3.4)					
								
E8. ST elevation (strain)	STSTRAIN	Missing	3(0.6)					
								
		N/A	2(0.4)					
								
		No	477(91.2)					
								
		Yes	41(7.8)					
								
E8a. ST elevation (strain): Inferior	STSTRAININF	Missing	6(1.1)					
								
		No	26(5.0)					
								
		Skipped	477(91.2)					
								
		Yes	14(2.7)					
								
E8b. ST elevation (strain): Anterior	STSTRAINANT	Missing	6(1.1)					
								
		No	12(2.3)					
								
		Skipped	477(91.2)					
								
		Yes	28(5.4)					
								
E8c. ST elevation (strain): Lateral	STSTRAINLAT	Missing	7(1.3)					
								
		No	32(6.1)					
								
		Skipped	477(91.2)					
								
		Yes	7(1.3)					
								
E9. ST depression (ischemia)	STISCHEM	Missing	4(0.8)					
								
		N/A	1(0.2)					
								
		No	478(91.4)					
								
		Yes	40(7.6)					
								
E9a. ST depression (ischemia): Inferior	STISCHEMINF	Missing	5(1.0)					
								
		No	22(4.2)					
								
		Skipped	478(91.4)					
								
		Yes	18(3.4)					
								
E9b. ST depression (ischemia): Anterior	STISCHEMANT	Missing	5(1.0)					
								
		No	20(3.8)					
								
		Skipped	478(91.4)					
								
		Yes	20(3.8)					
								
E9c. ST depression (ischemia): Lateral	STISCHEMLAT	Missing	5(1.0)					
								
		No	22(4.2)					
								
		Skipped	478(91.4)					
								
		Yes	18(3.4)					
								
E10. T wave inversion	TWAVEINV	Missing	4(0.8)					
								
		No	401(76.7)					
								
		Yes	118(22.6)					
								
E10a. T wave inversion: Inferior	TWAVEINVINF	Missing	5(1.0)					
								
		No	93(17.8)					
								
		Skipped	401(76.7)					
								
		Yes	24(4.6)					
								
E10b. T wave inversion: Anterior	TWAVEINVANT	Missing	4(0.8)					
								
		No	41(7.8)					
								
		Skipped	401(76.7)					
								
		Yes	77(14.7)					
								
E10c. T wave inversion: Lateral	TWAVEINVLAT	Missing	4(0.8)					
								
		No	68(13.0)					
								
		Skipped	401(76.7)					
								
		Yes	50(9.6)					
								
E11. Non-specific ST-T changes	NSPECSTT	Missing	3(0.6)					
								
		No	377(72.1)					
								
		Yes	143(27.3)					
								
Form Version	VER_ID	B	254(48.6)					
								
		C	177(33.8)					
								
		UNKNOWN	92(17.6)