Table 4. Comparing Baseline And Six-Month ECG Characteristics In 44 PPCM Patients With Follow-Up Data.

		Baseline % of population	6-month follow up % of population	p-value
Rate and rhythm	Mean heart rate (beats/min) ± SD	104 ± 18	77 ± 14	< 0.001
	Proportion in sinus rhythm	84 (95% CI: 70–93)	66 (95% CI: 50–80)	0.049
	Proportion with sinus tachycardia	48 (95% CI: 32–63)	7 (95% CI: 1–19)	< 0.001
	Proportion with arrhythmias
	• premature ventricular complex	2 (95% CI: 0.06–12)	2 (95% CI: 0.06–12)	1.0
	• sinus arrhythmias	7 (95% CI: 1–19)	27(95% CI: 15–43)	0.011
Axis	Proportion with QRS axis being:
	• abnormal	36 (95% CI: 22–52)	14(95% CI: 5–27)	0.014
	• left axis	18 (95% CI: 8–33)	7 (95% CI: 1–19)	0.107
	• right axis	11 (95% CI: 4–25)	5 (95% CI: 0.6–15)	0.237
	• indeterminate	7 (95% CI: 1–19 )	2 (95% CI: 0.06–12)	0.306
Conduction	Proportion with bundle branch block (BBB)	20 (95% CI: 10–35)*	18 (95% CI: 8–33)	0.787
	• left BBB	9 (95% CI: 3–22)	9 (95% CI: 3–22)	1.0
	• right BBB	2 (95% CI: 0.06–12)	2 (95% CI: 0.06–12)	1.0
Repolarisation	Proportion with T-wave abnormalities	45 (95% CI: 30–61)**	27(95% CI: 15–43)	0.123
	• major	30 (95% CI: 17–45)	34 (95% CI: 20–50)	0.647
	• minor	16 (95% CI: 7–30)	9 (95% CI: 3–22)	0.334
	Proportion with ST-segment changes
	• major ST changes	0	0	–
	• minor ST changes	2 (95% CI: 0.06–12)	0	0.315
	• ST-segment elevation	2 (95% CI: 0.06–12)	0	0.315
Hypertrophy	Proportion with left ventricular hypertrophy [Defined by Minnesota Codes III1 and (IV1-3 or V1-3)]	7 (95% CI: 1–19 )	7 (95% CI: 1–19 )	1.0
Atria	Proportion with atrial abnormalities	20 (95% CI: 10–35)**	9 (95% CI: 3–22)	0.133
	• left atrium	5 (95% CI: 0.6–15)	2 (95% CI: 0.06–12)	0.557
	• right atrium	9 (95% CI: 3–22)	7 (95% CI: 1–19)	0.694
	• bi-atrial	7 (95% CI: 1–19 )	0	0.078

*This sum exceeds that of individual BBB as some patients manifested incomplete BBB (either left or right).

**This sum exceeds that of individual sub-categories as some patients manifested features of each sub-category.