# 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. 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