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Table 1 Participant Characteristics Mean (SD) or %

From: Refining sleep measurement using the Motionwatch8©: how many days of monitoring do we need to get reliable estimates of sleep quality for older adults with mild cognitive impairment?

Participant Characteristic All Participants
(N = 151)
Older Adults without Mild Cognitive Impairment (N = 69) Older Adults with Mild Cognitive Impairment
(N = 82)
p-value*
Age 71.19 (7.26) 69.42 (6.36) 72.67 (7.66) < 0.01
%Female 66.89% 76.81% 58.54% 0.03
Body Mass Index (kg/m2) 26.71 (5.05) 25.91 (5.16) 27.45 (4.87) 0.13
%Retired 77.48% 78.26% 76.83% 0.99
Education
Less than high school diploma 4.64% 1.45% 7.32% 0.26
High school diploma 13.91% 14.49% 13.41%
Trade school 11.26% 7.25% 14.63%
Some university 15.89% 14.49% 17.07%
University degree or higher 54.30% 62.32% 47.56%
Smoking History
Current Smoker 1.32% 1.45% 1.22% 0.96
Past Smoker 49.67% 50.72% 48.78%
Non-Smoker 49.01% 47.83% 50.00%
Comorbidities
Hypertension 26.49% 17.39% 34.15% 0.03
Hypercholesterolemia 17.22% 13.04% 20.73% 0.30
Arthritis 13.25% 13.04% 13.41% 0.99
Mood Disorder 7.95% 10.14% 6.10% 0.54
Hypothyroidism 15.89% 20.23% 12.20% 0.26
Cardiovascular Disease 16.56% 7.25% 24.39% < 0.01
Diabetes Mellitus 2.65% 1.45% 3.66% 0.74
Cancer 1.99% 0.00% 3.66% 0.31
Number of Medications 2.27 (2.15) 2.01 (1.75) 2.49 (2.43) 0.17
Sleeping Medication Use 13.25% 17.39% 9.76% 0.26
Diagnosed Obstructive Sleep Apnea 3.57% 0.00% 7.17% 0.99
CPAPa Use 3.57% 0.00% 7.17% 0.99
MMSEb Score 28.89 (1.11) 29.22 (0.87) 28.61 (1.21) < 0.01
MoCAc Score 24.79 (2.83) 27.19 (1.10) 22.77 (2.19) < 0.01
Pittsburgh Sleep Quality Index Measures
Total Score 7.28 (4.00) 6.62 (5.44)* 7.47 (4.71)* 0.15*
Subjective Sleep Duration (min/day) 373.60 (73.43) 393.89 (111.30)* 363.23 (96.99)* 0.01*
MotionWatch8 Sleep Measures
Sleep Duration (min/day) 401.10 (51.23) 415.75 (79.05)* 390.18 (68.87)* < 0.01*
Fragmentation Index 31.17 (11.03) 30.51 (16.68)* 32.71 (14.76)* 0.23*
Sleep Efficiency 82.57 (6.10) 82.95 (9.06)* 82.05 (8.52)* 0.40*
Sleep Latency (min/day) 6.72 (9.00) 6.14 (13.70)* 7.35 (11.88)* 0.41*
Wake After Sleep Onset (min/day) 85.70 (34.43) 84.92 (53.52)* 87.78 (47.40)* 0.63*
Wake After Sleep Onset (min/day) 85.70 (34.43) 84.92 (53.52)* 87.78 (47.40)* 0.63*
  1. *P-values refer to group differences (i.e., t-tests, chi-square, or ANCOVA) between Older Adults with Mild Cognitive Impairment and those without
  2. *Controlling for age, sex, sleep medication use
  3. aContinuous Positive Air Pressure Machine
  4. bMini Mental State Exam
  5. cMontreal Cognitive Assessment