Skip to main content
. Author manuscript; available in PMC: 2013 Dec 1.
Published in final edited form as: Biol Psychol. 2012 Aug 30;91(3):334–341. doi: 10.1016/j.biopsycho.2012.08.008

Table 2.

Actigraphy-based sleep parameters (n = 56)

Overall Weekend (Friday/Saturday) Weekday (Sunday/Monday) Paired t-test

Sleep parameter Mean SD Range Mean SD Mean SD t p
Sleep onset 23:33 1:00 21:35 – 2:01 23:52 1:24 23:13 1:06 3.96 <.001
Midsleep 3:49 0:54 2:06 – 6:06 4:16 1:08 3:22 0:58 6.47 <.001
Sleep offset 8:07 0:52 6:35-10:11 8:41 1:02 7:32 1:05 7.19 <.001
Total sleep time (h) 8.20 0.59 5.8 – 9.7 8.46 0.95 7.92 1.04 -0.81 ns
Sleep latency (min) 20.44 10.13 6-72 20.28 17.58 22.52 14.26 -1.02 ns
Wake after sleep onset (min) 24.99 24.42 4-98 21.07 20.69 23.91 24.12 1.49 ns
Sleep efficiency (%) 95.18 4.5 80-99 96.02 3.66 95.19 4.86 3.34 0.002
Saturday-Sunday midsleep shift (h) 0.82 1.15 -2.00 – 3.02

NOTE: There were no significant sex-related differences on any sleep parameters, and only sleep onset significantly differed between pre/early and mid/late pubertal groups (t(54)=-2.09, p=0.04)

HHS Vulnerability Disclosure