. 2019 Nov 12;322(18):1799–1805. doi: 10.1001/jama.2019.16658

Table 2. Secondary and Tertiary Echocardiography End Points at Baseline and 6 Months Following Cardiac Resynchronization Therapy Implantation.

Variable	Baseline		6 Months		No. of Patients With Baseline and 6-mo Results	Absolute Change, Mean (SD)	P Value^a
Variable	No. of Patients	Mean (SD)	No. of Patients	Mean (SD)	No. of Patients With Baseline and 6-mo Results	Absolute Change, Mean (SD)	P Value^a
Left ventricular end-diastolic volume, mL	27	171.0 (47.2)	25	143.2 (41.2)	23	−31.9 (22.5)	<.001
Left ventricular end-systolic volume, mL	27	122.7 (37.1)	25	89.0 (32.2)	23	−37.0 (20.4)	<.001
Left ventricular ejection fraction, %	29	28.5 (3.8)	26	39.1 (7.1)	26	10.6 (6.6)	<.001
Left atrial volume, mL	29	60.3 (15.2)	26	47.9 (11.6)	26	−12.6 (9.6)	<.001

^{^a}

P value is derived from paired t tests examining absolute change from baseline to 6 months when normality assumptions were met.