TABLE 1.

Age-specific and age-standardized^a prevalence (P) of airflow obstruction, moderate and more severe airflow obstruction, and COPD among ever-employed U.S. adults for selected characteristics, NHANES 2007–2008 to 2011–2012

Characteristics	Ever-employed U.S. adults aged 18–79 yearsb					Ever-employed U.S. adults aged 20–79 yearsc
		Airflow obstructiond		Moderate and more severe airflow obstructione			COPDf
	Unweighted sample size	P (%)	95% CI	P (%)	95% CI	Unweighted sample size	P (%)	95% CI
Total	13 044g	12.40	11.63–13.18	3.05	2.67–3.43	15 777h	3.47	2.93–4.01
Age (years)
18–39 or 20–39	5263	9.87	8.76–10.98	0.81	0.51–1.12	5651	1.21	0.90–1.53
40–59	4513	13.56	11.81–15.32	3.80	2.82–4.78	5582	3.59	2.81–4.37
60–79	3268	16.06	14.56–17.55	6.83	5.80–7.86	4544	8.08	6.75–9.41
Gender
Male	6684	13.57	12.14–15.00	3.34	2.69–3.99	7959	3.06	2.43–3.69
Female	6360	11.25	10.07–12.43	2.77	2.26–3.28	7818	3.89	3.15–4.62
Race/Hispanic origin
Non-Hispanic White	5672	13.56	12.59–14.53	3.49	3.02–3.96	6741	3.85	3.13–4.57
Non-Hispanic Black	2859	11.24	9.89–12.58	2.95	2.17–3.74	3545	3.52	2.76–4.28
Mexican American	2042	8.18	7.17–9.20	0.75	0.43–1.07	2438	1.11	0.75–1.48
Other Hispanic	1363	8.54	6.98–10.11	1.51	1.00–2.01	1681	2.04	1.31–2.77
Education
Less than high school	3145	15.35	13.64–17.05	4.90	3.62–6.18	4100	6.30	4.87–7.73
High school graduate/GED	3055	14.02	12.26–15.79	3.90	3.06–4.74	3643	3.81	2.92–4.69
Some college/associate’s degree	3881	12.01	10.72–13.30	3.00	2.21–3.79	4504	3.49	2.93–4.05
4-year degree or more	2940	10.15	8.36–11.94	1.51	1.02–2.01	3516	1.44	0.96–1.92
BMI category (kg/m2)
Underweight (<18.5)	199	24.07	14.26–33.89	9.61*	3.09–16.14	242	8.61	4.89–12.32
Normal (18.5–24.9)	3722	15.99	14.13–17.85	3.77	2.52–5.01	4151	2.76	1.74–3.78
Overweight (25.0–29.9)	4328	12.53	11.47–13.58	2.77	2.22–3.31	5024	2.66	2.02–3.29
Obese (≥30.0)	4720	9.45	8.46–10.44	2.68	2.17–3.20	5703	4.72	3.92–5.52
Smoking status
Never smoker	7151	7.15	6.31–8.00	0.81	0.54–1.08	8474	1.48	1.12–1.84
Ever smoker	5849	18.47	17.29–19.65	5.45	4.70–6.20	7291	5.61	4.77–6.44
Cigarette pack (years)i
<3						1808	1.93	1.05–2.81
3–10.9						1798	3.87	2.36–5.38
11–26.9						1619	5.02	3.78–6.26
≥27						1669	12.44	8.96–15.91

CI, confidence interval.

^*RSE for the estimated prevalence with airflow obstruction >30% and ≤36%.

^aAge-standardized prevalence estimates were based on the age distribution of the 2000 U.S. Census Population 18–79 and 20–79 age structures. Age-specific estimates are reported for age categories. NHANES examination sampling weights were used for airflow obstruction outcomes and interview sampling weights were used for COPD outcome with the exception of examination sampling weights for BMI.

^bSample respondents aged 18–79 years with valid spirometry, height, and longest held occupation data were evaluated for airflow obstruction.

^cSample respondents aged 20–79 years with longest held occupation data were evaluated for COPD.

^dAirflow obstruction was defined as FEV1/FVC<LLN.

^eModerate and more severe airflow obstruction was defined as FEV1/FVC<LLN and FEV1<70% of the predicted value.

^fCOPD was self-reported, doctor or health professional diagnosis of chronic bronchitis (and still have chronic bronchitis) or self-reported emphysema.

^gFor airflow obstruction, 23 participants were missing education data, 75 missing BMI data, 44 missing smoking status data.

^hFor COPD, 14 participants were missing education data, 657 missing BMI data, 12 missing smoking status data.

ⁱPack-years were estimated for ever smokers aged 20–79 years. Pack-years were missing for 397 ever smokers.