Table 3. Binary logistic regression models for predictors of PPCM.

Variables	Odds ratio	95% CI	p-value
Univariate analysis
ECG heart rate, beats/min	1.078	1.048–1.109	< 0.001*
QRS duration, ms	1.038	1.013–1.065	0.003*
QTc interval, ms	1.036	1.019–1.054	< 0.001*
Normal heart rate	0.103	0.044–0.241	< 0.001*
QRS ≥ 110 ms	5.241	2.057–13.355	0.001*
QTc ≥ 460 ms	9.471	2.548–35.199	0.001*
ST–T-wave abnormalities	11.970	5.160–22.770	< 0.001*
Multivariate analyses
A (included variables: heart rate, QRS, QTc, ST–T-wave abnormalities)
ECG heart rate, beats/min	1.073	1.036–1.112	< 0.001*
ST–T-wave abnormalities	14.591	4.581–46.480	< 0.001*
QRS duration, ms	1.028	0.994–1.062	0.105
QTc interval, ms	1.014	0.993–1.035	0.202
B (included variables: heart rate, ST-Twave abnormalities, serum potassium level)
ECG heart rate, beats/min	1.066	1.029–1.104	< 0.001*
ST-T-wave abnormalities	12.056	3.507–4.443	< 0.001*
C (included variables: heart rate, ST-Twave abnormalities, serum sodium level)
ECG heart rate, beats/min	13.415	4.203–42.825	< 0.001*
ST–T-wave abnormalities	1.064	1.029–1.101	< 0.001*

*p-value statistically significant; ECG, electrocardiogram.