Table 2.

Association Between Demographic, Disease Severity, and Sleep Characteristics and Daytime Activity (N = 120)

Characteristic	Average Activity Counts/Min, Mean (95% Confidence Interval)	P-Value
Racea
African American	88 (76–100)	.01
Other	117 (95–138)
Sexa
Female	112 (96–128)	.007
Male	82 (68–96)
Ageb
50–59	121 (98–145)	<.001
60–69	107 (88–126)
70–79	72 (53–90)
≥80	62 (50–75)
Length of stay, daysb,c
0–3	112 (87–138)	.03
4–5	110 (81–139)
≥6	88 (76–100)
Charlson Comorbidity Indexb,d,e
0–1	125 (104–147)	.01
2–3	79 (66–91)
≥4	71 (60–83)
Objective sleep duration, minutesf
0–232.8	127 (100–153)	.02
232.9–365.4	83 (70–96)
>365.4	84 (70–98)
Objective sleep efficiency, %f
0–62.6	121 (97–145)	<.001
62.7–82.2	102 (84–119)
>82.2	70 (58–82)
Self-reported rest period, minutesg
<300	111 (79–142)	.56
300–450	86 (74–98)
>450	107 (83–130)
Individual sleep debt, minutesh
<300	87 (73–100)	.22
525–10,620	89 (72–106)
>10,620	121 (95–147)
Sleep disrupted by paine
1	95 (81–109)	.74
2–4	119 (91–147)
5	98 (69–127)

^aTwo-sample t-test with equal variances.

^bNonparametric test for trend across ordered groups.

^cN = 119.

^dN = 116.

^eBased on daily survey while hospitalized and in the study (1 = not disrupted to 5 = extremely disrupted).

^fObtained from actigraphy.

^gBased on self-reported sleep duration from month before hospital admission.

^hObtained from difference between objective sleep duration and self-reported rest period before hospital admission.