Table 1.
Subject Characteristics by Treatment Group: Counts and Means (SDs)
| CBT n = 24 | PL n = 23 | MED n = 23 | ||||
|---|---|---|---|---|---|---|
| Gender | ||||||
| Men | 8 | 9 | 3 | |||
| Women | 16 | 14 | 20 | |||
| Race | ||||||
| Black | 1 | 2 | 3 | |||
| White | 23 | 21 | 20 | |||
| Insomnia Typea,b | ||||||
| Onset | 11 | 8 | 5 | |||
| Maintenance | 5 | 7 | 5 | |||
| Terminal | 0 | 0 | 1 | |||
| Mixed | 3 | 3 | 3 | |||
| Combined | 3 | 5 | 9 | |||
|
| ||||||
| M | SD | M | SD | M | SD | |
|
| ||||||
| Age | 64.2 | 8.2 | 63.5 | 7.4 | 62.8 | 10.0 |
| Yrs Education | 14.7 | 2.5 | 15.0 | 2.1 | 13.6 | 2.6 |
| Yrs Insomnia Duration | 10.0 | 9.7 | 8.1 | 9.0 | 8.8 | 8.9 |
| Yrs Medication Duration | 5.3 | 5.0 | 3.9 | 4.7 | 3.6 | 4.1 |
Treatment Groups = CBT, cognitive-behavior therapy; PL, placebo; MED, medication withdrawal only.
Note. All comparisons between groups were ns.
a
The CBT count for insomnia type does not add to 24 due to missing data.
b
We defined insomnia types as follows: onset = only satisfied sleep onset criteria; maintenance = only satisfied sleep maintenance criteria; terminal = only satisfied terminal insomnia criteria; mixed = three bad nights a week were satisfied by adding bad onset and maintenance nights; combined = separately satisfied both onset and sleep maintenance criteria.