Skip to main content
. Author manuscript; available in PMC: 2009 Apr 1.
Published in final edited form as: J Psychosom Res. 2008 Apr;64(4):419–425. doi: 10.1016/j.jpsychores.2007.10.009

Table 2.

Subgroup characteristics at baseline

Variable Completers Non-Completers
Early Dropouts Late Dropouts
M SD M SD M SD
Age 48.65 14.36 47.73 16.11 46.61 13.77
Gender (% female) 55.8% 71.4% 58.5%
BDI 12.60 7.65 16.70 11.92 13.57 8.32
MECS 35.99 8.97 33.43 10.04 35.14 9.42
DBAS 61.81 15.31 63.94 15.70 62.52 14.25
Sleep Med (% yes) 58.0% 54.3% 55.7%
SOL (hours) 0.59 0.53 0.80 0.73 0.62 0.51
WASO (hours) 1.50 0.93 1.53 1.18 1.34 0.84
TST (hours) 6.18 1.26 4.87 1.76 6.24 1.36

Note. BDI = Beck Depression Inventory; MECS = Morningness-Eveningness Scale; DBAS = Dysfunctional Beliefs and Attitudes about Sleep; Sleep Med = use of any sleep medication at baseline; SOL = Sleep Onset Latency; WASO = Wake Time After Sleep Onset; TST = Total Sleep Time.