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Table 1 Characteristics of U.S. Adults with COPD, NHANES 2007–2012

From: Omega-3 fatty acid intake and prevalent respiratory symptoms among U.S. adults with COPD

Demographics  
Age (years) 60.6 ± 8.4
Male (%) 63.5
Ethnicity (%)
Non-hispanic White 85.1
Others 14.8
Pack-Years 30.4 ± 23.8
BMI, kg/m2 27.3 ± 4.9
Dietary Intake
Energy (kcal) 2112 ± 680
Omega-3
EPA + DHA (g) 0.11 ± 0.21
ALA (g) 1.71 ± 0.89
Omega-6
LA (g) 16.5 ± 8.0
Lung Function  
FEV1, L 2.5 ± 0.7
FVC, L 3.9 ± 0.9
FEV1/FVC 0.63 ± 0.06
Symptom Prevalence (%)
Chronic cough 19.2
Nocturnal cough 6.9
Phlegm 17.7
Wheeze (any) 21.0
Nocturnal Wheeze 9.4
Wheeze with exertion 8.1
Meds for wheeze 5.4
  1. Mean ± SD unless otherwise noted
  2. n = 878
  3. BMI: Body Mass Index; EPA: eicosapentaenoic acid; DHA: docosahexaenoic acid; ALA: alpha-linolenic acid; LA: linoleic acid; FEV1: forced expiratory volume in one second; FVC: forced vital capacity