Table 1.

Correlation analysis of echocardiographic and ECG measurements of 2‐ to 24‐month‐old C57Bl/6J mice

Echocardiography versus ECG Correlation	n	r	P
LA diameter versus P dur	114	0.33	0.0004***
LA area versus P dur	90	0.42	<0.0001***
LV Mass versus QRS	147	0.16	0.0606 ns
LV Mass versus QRSp	147	0.37	<0.0001***
LV Mass versus PQ	147	0.24	0.0038**
PQ versus HR	147	0.12	0.1559 ns
P dur versus HR	121	0.30	0.0009***

n, number of mice; r, correlation coefficient; P, P value of significance; LA, left atrium; P dur, duration of P wave; P Amp, Amplitude of P wave; LV, Left ventricle; HR, heart rate.