Short-Term Effects of Electroconvulsive Therapy on Subjective and Actigraphy-Assessed Sleep Parameters in Severely Depressed Inpatients
Table 3
Effects of electroconvulsive therapy on objective parameters in 12 patients with a depressive episode.
ECT on present day
ECT not on present day
Test
value
SART total number of error
20
20.5 (SE 5.9)
28
20.6 (SE 5.7)
(1, 35.4) = 0.00
0.99
SART false positive reaction
20
10.7 (SE 1.5)
28
11.2 (SE 1.5)
(1, 36.2) = 0.29
0.59
SART false negative reaction
20
9.8 (SE 5.2)
28
9.4 (SE 5.1)
(1, 35.4) = 0.02
0.88
SART mean reaction latency
20
352 (SE 26)
28
346 (SE 26)
(1, 35.5) = 0.40
0.53
ECT on previous day
ECT not on previous day
Test
value
Sleep onset latency (min)
18
14.8 (SE 5.1)
24
8.6 (SE 4.9)
(1, 30.8) = 1.54
0.22
Wakefulness after sleep onset (min)
18
37.1 (SE 6.4)
24
34.2 (SE 6.1)
(1, 28.5) = 0.21
0.65
Actual wake (%)
18
6.43 (SE 1.16)
24
6.62 (SE 1.11)
(1, 28.8) = 0.03
0.86
Number of awakenings (no.)
18
18.2 (SE 14.1)
24
15.9 (SE 2.1)
(1, 29.5) = 1.07
0.31
Sleep efficiency (%)
18
90.7 (SE 1.5)
24
91.8 (SE 1.4)
(1, 29.5) = 0.73
0.40
Activity score/60 sec
18
8.34 (SE 2.01)
24
9.78 (SE 1.99)
(1, 30.1) = 0.39
0.54
Fragmentation index
18
24.4 (SE 3.5)
24
19.0 (SE 3.4)
(1, 29.2) = 3.22
0.08
ECT denoted electroconvulsive therapy. SART denotes Sustained Attention to Response Task. Data are adjusted mean and standard errors (SE) between brackets. All means and values were analysed by mixed models. Total number of errors, false positive reactions, and false negative reactions were adjusted for age, sex, and mean reaction latency, whereas the mean reaction latency was adjusted for age, sex, and standard deviation of the reaction latency. Actigraphy parameters were adjusted for age and sex. indicates the number of time points (i.e., days) of the measurements.
