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54 Stratos LV/LV-T Technical Manual
Table 13: Patient Demographics at Pre-Enrollment
Characteristic
Study
N=133
Control
N=67
P-
value
Age at Enrollment (Years)
Mean ± SE
Range
69.5 ± 0.9
43 to 88
69.1 ± 1.2
38 to 84
0.781*
Gender
Male
Female
93 (69.9%)
40 (30.1%)
51 (76.1%)
16 (23.9%)
0.407**
Underlying Heart Disease
Ischemic Cardiomyopathy
Nonischemic Cardiomyopathy
100 (75.2%)
34 (25.6%)
54 (80.6%)
15 (22.4%)
0.294***
Type of Bundle Branch Block
Left Bundle Branch Block
Right Bundle Branch Block
Other
91 (68.4%)
26 (19.5%)
19 (14.3%)
49 (73.1%)
10 (14.9%)
11 (16.4%)
0.877***
New York Heart Association
Class
Class III
Class IV
121 (91.0%)
12 (9.0%)
60 (89.6%)
7 (10.4%)
0.800**
Intrinsic QRS Duration (ms)
Mean ± SE
Range
161.9 ± 2.0
130 to 252
156.1 ± 2.3
130 to 200
0.073*
Left Ventricular Ejection
Fraction (%)
Mean ± SE
Range
22.1 ± 0.6
5 to 35
23.3 ± 0.8
10 to 35
0.255*
Six Minute Walk Distance
(meters)
Mean ± SE
Range
254.8 ± 8.9
20 to 451
250.5 ±
11.9
27 to 447
0.775*
Quality of Life Questionnaire
Score
Mean ± SE
Range
54.3 ± 2.1
0 to 105
52.5 ± 3.1
0 to 102
0.638*
*Student's t-test (2-sided) for means, **Fisher's Exact Test (2-sided) for 2
possible answers, ***Chi-Square test (2-sided) for more than 2 possible answers