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. Author manuscript; available in PMC: 2017 Oct 27.
Published in final edited form as: J Clin Psychiatry. 2016 Oct;77(10):e1218–e1225. doi: 10.4088/JCP.15m09879

Table 4.

Actigraphy outcomes at baseline and Week 2 by TIB condition.

6h TIB (n=41)
Actigraphy Variable 8h TIB
(n=17)
Late Bedtime
(n=18)
Early Risetime
(n=23)
8h vs. 6h
TIB p-value
Mean SD Mean SD Mean SD
Time in Bed (hh:mm)
 Baseline 8:01 0:06 7:58 0:07 8:00 0:09 0.53
 Week 2 8:01 0:30 6:42 0:59 7:00 1:20 <0.001
Total sleep time (hh:mm)
 Baseline 6:20 0:50 6:27 0:44 6:39 0:30 0.31
 Week 2 6:37 1:00 5:41 0:53 6:09 1:10 0.03
Sleep efficiency (%)
 Baseline 79.3 10.6 80.8 9.2 83.2 6.2 0.31
 Week 2 82.6 10.4 85.3 9.4 88.0 6.5 0.10
Sleep latency (mins)
 Baseline 24.2 26.1 33.2 15.0 22.1 19.3 0.63
 Week 2 15.2 13.3 10.4 11.2 8.4 8.4 0.07
Wake after Sleep Onset (mins)
 Baseline 52.4 28.0 43.4 21.4 41.3 23.2 0.18
 Week 2 44.8 23.2 29.3 17.5 27.5 18.9 0.006

Note: boldface type denotes significant findings

Abbreviations

mins = minutes

6h TIB = 6 hours time in bed

8h TIB = 8 hours time in bed