Table I.
Subject characteristics (weighted total N=57,726,856; unweighted total N=45,409)
| Characteristic, weighted % (95% CI) | AD in past 12 months | No AD in past 12 months | p-value |
|---|---|---|---|
| Weighted N = 6,807,687 (11.8%) | Weighted N = 50,919,169 (88.2%) | ||
| Sex | |||
| Male | 48.6 (46.9-50.3) | 51.3 (50.7-52.0) | 0.004 |
| Female | 51.4 (49.7-53.1) | 48.7 (48.0-49.3) | |
| Age, y, mean (95% CI) | 10.08 (9.9-10.2) | 10.56 (10.5-10.6) | <0.001 |
| Ethnicity | |||
| Non-Hispanic | 80.3 (78.7-81.8) | 75.1 (74.0-76.1) | <0.001 |
| Hispanic | 19.7 (18.2-21.3) | 24.9 (23.9-26.0) | |
| Race | |||
| White | 66.6 (64.7-68.5) | 75.2 (74.3-76.0) | <0.001 |
| Black / African American | 20.9 (19.3-22.6) | 13.9 (13.2-14.5) | |
| American Indian / Alaskan Native | 0.9 (0.6-1.3) | 1.2 (1.0-1.5) | |
| Asian | 5.3 (4.5-6.2) | 5.4 (5.1-5.7) | |
| Multiracial | 6.3 (5.5-7.1) | 4.4 (4.1-4.7) | |
| Region | |||
| Northeast | 15.7 (14.1-17.4) | 16.4 (15.5-17.4) | 0.72 |
| Midwest | 22.5 (20.9-24.2) | 22.4 (21.4-23.3) | |
| South | 37.5 (35.4-39.6) | 37.5 (36.2-38.8) | |
| West | 24.4 (22.5-26.4) | 23.7 (22.6-24.9) | |
| Total annual household income | |||
| $0–34,999 | 28.8 (27.1-30.5) | 26.4 (25.6-27.1) | <0.001 |
| $35,000–74,999 | 25.6 (24.0-27.3) | 26.3 (25.6-26.9) | |
| $75,000-99,999 | 11.3 (10.2-12.4) | 11.3 (10.9-11.8) | |
| ≥ $100,000 | 28.2 (26.4-30.1) | 27.2 (26.4-28.1) | |
| Not reported / unknown | 6.1 (5.3-7.0) | 8.8 (8.4-9.2) | |
| Highest parental education | |||
| Less than high school | 6.8 (5.9-7.8) | 9.8 (9.3-10.3) | <0.001 |
| High school graduate / GED | 15.9 (14.7-17.3) | 18.0 (17.4-18.6) | |
| Some college, no degree | 19.2 (17.9-20.5) | 17.8 (17.2-18.4) | |
| Associate degree | 16.0 (14.7-17.4) | 13.9 (13.5-14.4) | |
| Bachelor degree | 23.7 (22.1-25.3) | 22.6 (22.0-23.2) | |
| Master, professional, or doctoral degree | 18.5 (17.0-20.0) | 17.9 (17.3-18.6) | |
| Parental presence in family | |||
| Mother only | 30.0 (28.4-31.6) | 23.5 (22.9-24.2) | <0.001 |
| Father only | 2.9 (2.4-3.5) | 4.2 (4.0-4.5) | |
| Both mother and father | 64.5 (62.8-66.2) | 68.8 (68.1-69.6) | |
| Neither mother nor father | 2.6 (2.1-3.2) | 3.4 (3.2-3.7) | |
| History of asthma | 27.5 (26.0-29.2) | 13.6 (13.2-14.1) | <0.001 |
| History of hayfever in last 12 mon | 19.7 (18.4-21.1) | 8.1 (7.8-8.5) | <0.001 |
| History of respiratory allergy in last 12 mon | 24.6 (23.0-26.3) | 9.9 (9.5-10.3) | <0.001 |
| History of attention deficit hyperactivity disorder | 13.3 (12.1-14.6) | 9.4 (9.0-9.8) | <0.001 |
| History of autism | 4.0 (3.2-4.9) | 2.3 (2.0-2.5) | <0.001 |
| Has taken prescription medication for 3+ mon | 27.0 (25.5-28.6) | 13.2 (12.8-13.7) | <0.001 |
| General health status | |||
| Excellent | 49.5 (47.6-51.2) | 59.0 (58.3-59.8) | <0.001 |
| Very good | 28.2 (26.6-29.8) | 25.4 (24.8-26.0) | |
| Good | 18.3 (17.1-19.7) | 14.0 (13.5-14.5) | |
| Fair | 3.5 (2.8-4.2) | 1.3 (1.2-1.5) | |
| Poor | 0.6 (0.3-0.9) | 0.23 (0.2-0.3) | |
| Has health insurance coverage | 95.3 (94.4-96.0) | 94.1 (93.8-94.5) | 0.01 |
AD, atopic dermatitis; CI, confidence interval. Means, prevalence (%) and 95% CI are weighted. P-values are from chi-square test with Rao-Scott complex sample design adjustment [for categorical variables] or the survey analysis equivalent of a two-sample t-test [for continuous variables].
Data Source: NCHS, National Health Interview Survey, 2013-2017.