Table 8

Average measures of sleep diary parameters of 20 AS subjects compared with 9 controls. In each subject the values from each consecutive nights were averaged and these individual average values were compared on a group level. To study the night-to-night variability the standard deviations of each individual were compared on group level. Time values of h:min are given.

AS
 CO

Mean
 SEM
 Mean
 SEM
 Diff.
 t(df), p
time of retiring to bed 1
 23:54
 0:18
 23:18
 0:31
 0:36
 t = 1,054 (27), ns
SD 1
 1:34
 0:12
 1:03
 0:10
 0:30
 t = 1,533 (27), ns
time of falling asleep 1
 0:38
 0:21
 23:48
 0:29
 0:50
 t = 1,343 (26), ns
SD 1
 1:34
 0:11
 1:08
 0:10
 0:26
 t = 1,388 (26), ns
time of awakening 1
 8:39
 0:15
 7:42
 0:17
 0:56
 t = 2,106 (27), 0,045
SD 1
 1:38
 0:09
 0:55
 0:10
 0:43
 t = 2,810 (27), 0,009
sleep latency 1
 0:54
 0:08
 0:31
 0:09
 0:22
 t = 1,599 (26), ns
SD 2
 0:46
 0:07
 0:24
 0:09
 0:21
 T = 92, ns (P = 0,062)
time in bed 1
 8:44
 0:10
 8:25
 0:25
 0:18
 t = 0,799 (27), ns
SD 1
 1:31
 0:08
 1:06
 0:09
 0:24
 t = 1,702 (27), ns
sleep period 1
 7:56
 0:12
 7:53
 0:23
 0:02
 t = 0,126 (26), ns
SD 1
 1:37
 0:10
 1:11
 0:09
 0:26
 t = 1,583 (26), ns
sleep quality 1
 6,6
 0,2
 8,6
 0,1
 2,0
 t = 6.186 (25) <0.001
SD 1
 1,4
 0,1
 0,8
 0,1
 0,6
 t = 3.254 (25) 0.003
wake after sleep onset 2
 0:28
 0:06
 0:11
 0:02
 0:17
 T = 94 P = 0.056
SD 2
 0:30
 0:05
 0:13
 0:02
 0:17
 T = 95 P = 0.063
sleep efficiency (%) 1
 84,4
 1,9
 91,5
 1,4
 7.1
 t = -2.379 (26) P = 0.025
SD (%) 1
 11,3 11,3
 1,4
 6,6
 1,2
 4,7
 t = 2.142 (26) P = 0.042

1 Students t-test 2 Mann-Whitney rank sum test Diff. = difference of means between AS subjects and controls ns = no statistically significant difference between AS subjects and controls

Tani et al. BMC Psychiatry 2003 3:12   doi:10.1186/1471-244X-3-12