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Table 1 Subject characteristics by obstructive sleep apnea statusa

From: Fatigue and sleepiness determine respiratory quality of life among veterans evaluated for sleep apnea

  All subjects None to mild OSAb Moderate to severe OSA  
Subject characteristics N = 1578 N = 755 N = 823 p-value
Age, years 61.1 (16.8) 58 (22.2) 63.3 (13.5) <0.001
Male, n (%) 1482 (93.9%) 686 (91.9%) 796 (96.7%) <0.001
Ethnicity
 White 996 (63.1%) 480 (63.6%) 516 (62.7%) 0.72
 Non-white 582 (36.9%) 275 (36.4%) 307 (37.3%)
<High School Education 325 (20.6%) 154 (20.4%) 171 (20.8%) 0.85
Married/partnered 1039 (65.8%) 469 (62.1%) 570 (69.3%) <0.01
Currently Employed 558 (35.4%) 289 (38.3%) 269 (32.7%) <0.05
BMI, kg/m3 32.2 (8.1) 30.6 (6.3) 34.3 (8.8) <0.001
Smoking status 0.03c
 Never 553 (35.1%) 280 (37.1%) 273 (33.2%)  
 Former 826 (52.3%) 369 (48.9%) 457 (55.5%)
 Current 199 (12.6%) 106 (14.0%) 93 (11.3)
Any Lung Disease 262 (16.6%) 129 (17.1%) 133 (16.2%) 0.62
 COPD 94 (6.0%) 50 (6.6%) 44 (5.3%) 0.29
 Asthma 181 (11.5%) 90 (11.9%) 91 (11.1%) 0.59
 ILD 8 (0.5%) 0 (0%) 8 (1.0%) <0.01d
  1. a Abbreviations: BMI Body Mass Index, COPD chronic obstructive pulmonary disease, ILD interstitial lung disease, OSA obstructive sleep apnea
  2. bNone or mild OSA defined as an apnea-hypopnea index <15 events per hour. Moderate and severe obstructive sleep apnea defined as an apnea-hypopnea index ≥15 events per hour
  3. c P-value for 2*3 χ2 test. P-value for 2*2 test comparing ever with never smokers is 0.10
  4. d P-value for Fisher exact 2-sided test