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Questions Rating Category 1. Please rate the current (i.e., last 2 weeks) severity of your insomnia problem(s). None Mild Moderate Severe Very Severe Difficulty falling asleep 0 1 2 3 4 Difficulty staying asleep 0 1 2 3 4 Problem waking up too early 0 1 2 3 4 2. How satisfied/dissatisfied are you with your current sleep pattern? Very Satisfied Satisfied Neutral Dissatisfied Very Dissatisfied 0 1 2 3 4 3. To what extent do you consider your sleep problem to interfere with your daily functioning (e.g., daytime fatigue, ability to function at work/daily chores, concentration, memory, mood, etc.)? Not At All Interfering A Little Somewhat Much Very Much Interfering 0 1 2 3 4 4. How noticeable to others do you think your sleeping problem is in terms of impairing the quality of your life? Not At All Noticeable A Little Somewhat Much Very Much Noticeable 0 1 2 3 4 5. How worried/distressed are you about your current sleep problem? Not At All Worried A Little Somewhat Much Very Much Worried 0 1 2 3 4 Adapted with permission from Ref. 41.
- Table 2.
Demographic and Symptom Characteristics for Obstructive Sleep Apnea (OSA) and Non-OSA Subjects
OSA (n = 23) Non-OSA (n = 77) χ2 (Contingency Coefficient) P Male (%) 39 46 0.287 (0.54) .592 Married (%) 65 58 9.60 (0.296) .087 White (%) 78 82 1.37 (0.116) .849 Employed, full time (%) 61 52 1.20 (0.109) .878 Mean (SD) Mean (SD) t P Age 52.7 (13.8) 53.3 (16.0) −0.152 .880 BMI* 34.9 (7.7) 30.2 (6.6) 2.79 .006 ISI total score 12.0 (6.7) 6.4 (4.7) 4.55 .000 ESS total score 10.9 (4.2) 7.2 (3.7) 4.12 .000 ↵* Body mass index (BMI) statistics are calculated for only 97 subjects (n = 22 OSA; n = 75 non-OSA).
ESS, Epworth Sleepiness Scale; ISI, Insomnia Severity Index.
- Table 3.
Classification Statistics for the Logistic Regression Model for Prediction of Sleep Apnea With (Step 2) and Without (Step 1) Inclusion of Insomnia Symptoms
Logistic Regression % Correct Sensitivity Specificity Positive Predictive Value Negative Predictive Value Step 1* 80.4 0.29 0.95 0.60 0.83 Step 2† 85.6 0.48 0.96 0.77 0.87
