Table 1.

Baseline Values of Demographic, Health, Sleep, and Pain Measures for the Education-Only Control (EOC), Cognitive-Behavioral Therapy for Pain (CBT-P) and Cognitive-Behavioral Therapy for Pain and Insomnia (CBT-PI) Groups

Measure	EOC, n = 123	CBT-P, n = 122	CBT-PI, n = 122	P-Valuea
Age, mean ± SD	73.1 ± 8.0	73.0 ± 8.4	73.2 ± 8.1	.97
Female, %	75.6	80.3	79.5	.63
Retired, %	78.2	73.6	83.6	.16
Caucasian, %	90.2	91.7	91.8	.89
Some college, %	87.8	86.9	84.4	.73
Modified Mini-Mental State Examination score (range 0–100)
Mean ± SD	93.1 ± 5.3	94.0 ± 4.8	93.3 ± 4.4	.37
< 90, %	15.5	17.2	18.0	.86
Geriatric Depression Scale score (range 0–30)
Mean ± SD	7.0 ± 5.6	6.6 ± 4.5	6.5 ± 5.1	.64
>14, %	17.1	9.1	9.8	.11
Chronic illness, %	49.6	49.2	59.8	.17
Medications, %
Antidepressants	17.1	23.8	26.5	.19
Antipsychotics	0	0.8	0.8	.60
Anxiolytics	8.1	9.0	12.4	.50
Hypnotics	10.6	20.5	22.3	.04
Analgesics	92.7	94.3	84.3	.02
Insomnia Severity Index (range 0–28)
Mean ± SD	11.5 ± 5.1	11.8 ± 4.7	11.2 ± 5.2	.60
>15, %	24.4	26.2	28.7	.75
Sleep efficiency, mean ± SD (range 0–100)b	83.0 ± 8.9	83.1 ± 8.7	81.6 ± 9.1	.37
Total sleep time, mean ± SDb	413.8 ± 66.6	430.2 ± 63.9	417.7 ± 73.6	.16
Total wake time, mean ± SDb	85.3 ± 46.4	89.1 ± 47.9	93.9 ± 48.4	.39
Pain severity (range 0–10)
Mean ± SD	4.1 ± 1.5	4.3 ± 1.6	4.6 ± 1.5	.09
>5, %	33.3	35.3	42.6	.28
Arthritis symptoms, mean ± SD (range 0–10)	6.1 ± 2.2	5.9 ± 2.3	6.1 ± 2.1	.75
Average pain, mean ± SD (range 0–10)	4.7 ± 1.6	4.8 ± 1.6	4.9 ± 1.4	.57
Pain disability, mean ± SD (range 0–100)	34.6 ± 23.2	36.0 ± 22.5	38.6 ± 22.2	.38

SD = standard deviation.

^aP-values are for chi-square tests for dichotomous variables and analyses of variance for continuous variables.

^bActigraphically derived.