Table 2.

Baseline rhythm characteristics (within 6 months of implant), stratified by programming at implant

	Nominal (n=1559)	AV adjusted (n=2294)	p value (vs. nominal)	VV adjusted (n=604)	p value (vs. nominal)	AV and VV adjusted (n=852)	p value (vs. nominal)
Patient activity (%)	6.7 (4.0)	7.3 (4.3)	<0.0001	6.5 (4.0)	0.2	6.9 (4.0)	0.3
HRV SDANN	70.1 (20.4)	70.6 (18.9)	0.6	70.1 (20.3)	1	70.7 (20.3)	0.6
HRV footprint	28.2 (9)	28.3 (8.7)	0.9	27.5 (9.5)	0.3	28.3 (9.2)	0.9
HRV mean HR	77.2 (8.2)	77.2 (8.3)	0.9	77.4 (9.3)	0.7	76.6 (8.8)	0.2
AF burden >5 %	21.7 %	11.7 %	<0.0001	22.0 %	0.9	11.0 %	<0.0001
Atrial pacing (%)	32 (36)	27 (33)	0.01	27 (35)	0.0001	27 (35)	0.005
LV pacing <95 %	17.6 %	17.7 %	0.9	15.9 %	0.3	14.9 %	0.08
Any shock within 6 months of implant	6.1 %	6.9 %	0.3	7.6 %	0.2	7.4 %	0.2
ATP therapy	12.9 %	16.7 %	0.0005	16.2 %	0.04	18.2 %	0.0002

Numbers are % or mean (standard deviation)

AV atrioventricular timing, VV ventricular-to-ventricular timing, ATP anti-tachycardia pacing, AF atrial fibrillation, LV left ventricular, HRV heart rate variability, SDANN standard deviation of the average NN intervals, HR heart rate