Table 1.
Baseline characteristics of adults with asthma in NHANES 1999–2018.
| Characteristics | Overall, N = 40,497 (100%) | Asthma | P Value | |
|---|---|---|---|---|
| No, N = 35,028 (86%) | Yes, N = 5469 (14%) | |||
| Sex, % | < 0.001 | |||
| Female | 20,896 (52%) | 17,712 (51%) | 3,184 (59%) | |
| Male | 19,601 (48%) | 17,316 (49%) | 2,285 (41%) | |
| Age, % | < 0.001 | |||
| 20–35 years | 10,625 (28%) | 8,939 (27%) | 1,686 (33%) | |
| 35–60 years | 16,551 (48%) | 14,365 (48%) | 2,186 (45%) | |
| 60 + years | 13,321 (24%) | 11,724 (25%) | 1,597 (22%) | |
| Race/ethnicity, % | < 0.001 | |||
| Non-Hispanic White | 18,376 (69%) | 15,687 (69%) | 2,689 (71%) | |
| Non-Hispanic Black | 8,123 (11%) | 6,856 (10%) | 1,267 (12%) | |
| Mexican American | 6,965 (8.3%) | 6,427 (8.9%) | 538 (4.8%) | |
| Other Race—Including Multi-Racial | 3,633 (6.9%) | 3,175 (6.9%) | 458 (6.7%) | |
| Other Hispanic | 3,400 (5.3%) | 2,883 (5.2%) | 517 (5.8%) | |
| Education level, % | 0.001 | |||
| Below high school | 10,600 (17%) | 9,349 (17%) | 1,251 (15%) | |
| High school | 9,400 (24%) | 8,181 (24%) | 1,219 (22%) | |
| Above high school | 20,497 (59%) | 17,498 (59%) | 2,999 (62%) | |
| Marital status, % | < 0.001 | |||
| Married/cohabiting | 24,639 (64%) | 21,667 (65%) | 2,972 (58%) | |
| Widowed/divorced/separated | 8,809 (18%) | 7,485 (18%) | 1,324 (20%) | |
| Never married | 7,046 (17%) | 5,873 (17%) | 1,173 (21%) | |
| Family PIR, % | < 0.001 | |||
| ≤ 1.0 | 7,617 (14%) | 6,364 (13%) | 1,253 (18%) | |
| 1.1–3.0 | 15,745 (36%) | 13,673 (36%) | 2,072 (36%) | |
| > 3.0 | 13,986 (50%) | 12,225 (51%) | 1,761 (46%) | |
| Smoking status, % | < 0.001 | |||
| Never smoker | 21,981 (54%) | 19,288 (54%) | 2,693 (50%) | |
| Former smoker | 9,979 (25%) | 8,565 (25%) | 1,414 (26%) | |
| Current smoker | 8,537 (21%) | 7,175 (21%) | 1,362 (25%) | |
| Drinking status, % | 0.3 | |||
| Drinker | 5,245 (11%) | 4,521 (11%) | 724 (12%) | |
| Nondrinker | 35,252 (89%) | 30,507 (89%) | 4,745 (88%) | |
| Body mass index, % | < 0.001 | |||
| Underweight, kg/m2 | 647 (1.6%) | 562 (1.6%) | 85 (1.5%) | |
| Normal, kg/m2 | 11,339 (29%) | 10,036 (30%) | 1,303 (26%) | |
| Obese, kg/m2 | 14,761 (35%) | 12,293 (34%) | 2,468 (42%) | |
| Overweight, kg/m2 | 13,750 (34%) | 12,137 (34%) | 1,613 (30%) | |
| Age, years | 46.0 (33.0, 59.0) | 46.0 (33.0, 59.0) | 44.0 (30.0, 58.0) | < 0.001 |
| Family PIR | 3.00 (1.50, 5.00) | 3.05 (1.55, 5.00) | 2.70 (1.27, 4.81) | < 0.001 |
| BMI , kg/m2 | 28 (24, 32) | 28 (24, 32) | 29 (24, 34) | < 0.001 |
| Waist Circumference (cm) | 97 (87, 108) | 97 (87, 108) | 99 (87, 111) | < 0.001 |
| Activated physical activity, % | 7,777 (66%) | 6,815 (66%) | 962 (68%) | 0.10 |
| Self-reported hypertension, % | 13,925 (31%) | 11,717 (30%) | 2,208 (35%) | < 0.001 |
| Self-reported diabetes, % | 5,944 (11%) | 5,013 (10%) | 931 (12%) | 0.003 |
| White blood cell | 6.90 (5.70, 8.40) | 6.90 (5.70, 8.40) | 7.20 (5.90, 8.80) | < 0.001 |
| Neutrophils | 4.10 (3.20, 5.20) | 4.00 (3.20, 5.10) | 4.20 (3.20, 5.40) | < 0.001 |
| Monocyte | 0.50 (0.40, 0.70) | 0.50 (0.40, 0.70) | 0.50 (0.40, 0.70) | 0.004 |
| Lymphocyte | 2.00 (1.60, 2.50) | 2.00 (1.60, 2.50) | 2.10 (1.70, 2.50) | < 0.001 |
| Platelet | 246 (209, 290) | 245 (208, 289) | 251 (213, 297) | < 0.001 |
| ALI | 61 (44, 81) | 61 (44, 81) | 62 (46, 82) | 0.030 |
| ALI classifcation | 0.040 | |||
| Quartile 1 | 10,125 (24%) | 8,841 (24%) | 1,284 (23%) | |
| Quartile 2 | 10,124 (27%) | 8,796 (27%) | 1,328 (26%) | |
| Quartile 3 | 10,124 (26%) | 8,709 (26%) | 1,415 (28%) | |
| Quartile 4 | 10,124 (23%) | 8,682 (23%) | 1,442 (23%) | |
PIR, poverty income ratio; ALI, advanced lung cancer inflammation index.
Normally distributed continuous variables are described as means ± SEs, and continuous variables without a normal distribution are presented as medians [interquartile ranges]. Categorical variables are presented as numbers (percentages). N reflect the study sample while percentages reflect the survey-weighted.