Table 2 Unadjusted characteristics of study population - NHANES, 2007–2010
Characteristic | Na | %b | (95% CI) |
|---|---|---|---|
Total | 5139 | 100.0 | |
Sex | |||
Men | 2572 | 49.0 | (47.8-50.1) |
Women | 2567 | 51.0 | (49.9-52.2) |
Age category (years) | |||
40-49 | 1523 | 35.2 | (32.9-37.6) |
50-59 | 1385 | 32.7 | (30.8-34.6) |
60-69 | 1364 | 21.0 | (19.6-22.4) |
70-79 | 867 | 11.1 | (10.3-12.0) |
Race/Ethnicity | |||
White (Non-Hispanic) | 2566 | 75.4 | (70.5-79.7) |
Black (Non-Hispanic) | 963 | 9.7 | (7.7-12.1) |
Mexican-American | 872 | 6.2 | (4.2-8.9) |
Other/Multiracial | 738 | 8.8 | (6.8-11.3) |
Education (years) | |||
<12 | 1467 | 17.4 | (15.3-19.7) |
12 | 1225 | 24.9 | (22.7-27.3) |
>12 | 2447 | 57.7 | (54.1-61.3) |
Non-respiratory chronic illnesses c | |||
None | 2164 | 45.3 | (42.4-48.2) |
1-2 | 2395 | 45.3 | (43.0-47.7) |
≥3 | 580 | 9.4 | (8.1-10.8) |
BMI category | |||
Underweight/normal (<25.0 kg/m2) | 1177 | 25.8 | (23.6-28.2) |
Overweight (25.0-29.9 kg/m2) | 1885 | 36.9 | (34.6-39.2) |
Obese (≥30 kg/m2) | 2077 | 37.3 | (35.1-39.5) |
Smoking status | |||
Current | 1036 | 18.4 | (16.5-20.6) |
Former | 1563 | 30.3 | (28.0-32.7) |
Never | 2539 | 51.3 | (48.8-53.8) |
Lung function category | |||
Normal lung function | 3698 | 72.9 | (70.8-74.8) |
Restrictive impairment | 438 | 7.2 | (6.2-8.4) |
Mild obstruction | 524 | 10.9 | (9.4-12.6) |
Moderate–severe obstruction | 479 | 9.0 | (7.8-10.3) |
Respiratory symptoms | |||
Frequent cough | 521 | 10.4 | (9.0-12.0) |
Frequent phlegm | 445 | 7.8 | (7.0-8.7) |
Past year wheeze | 678 | 12.9 | (11.4-14.5) |
Any symptoms | 1087 | 21.0 | (19.0-23.2) |
No symptoms | 4052 | 79.0 | (76.8-81.0) |
1 symptom | 670 | 13.4 | (11.9-15.2) |
2 symptoms | 277 | 5.0 | (4.3-5.9) |
3 symptoms | 140 | 2.5 | (2.0-3.2) |
Health-related quality of life | |||
Fair/poor health | 1248 | 16.3 | (14.4-18.4) |
Frequent physical distressd | 691 | 11.3 | (9.7-13.1) |
Frequent mental distresse | 627 | 11.6 | (10.2-13.0) |
Frequent activity limitationf | 322 | 5.3 | (4.4-6.4) |