Table II.
Unadjusted (Model 1) and adjusted (Models 2 and 3) odds ratios for hay fever among US adults*, NHIS 1997–2013
| Variables | Categories | Model 1 | Model 2 | Model 3 |
|---|---|---|---|---|
| OR (95% CI) | OR (95% CI) | OR (95% CI) | ||
| EHE95 | Ptrend <0.001 | Ptrend <0.05 | Ptrend <0.05 | |
| Q1 (0–10 days)# | 1.00 | 1.00 | 1.00 | |
| Q2 (11–16 days) | 1.06 (1.02–1.10) | 1.05 (1.01–1.09) | 1.05 (1.00–1.09) | |
| Q3 (17–24 days) | 1.04 (1.00–1.08) | 1.05 (1.00–1.09) | 1.04 (1.00–1.09) | |
| Q4 (≥25 days) | 1.07 (1.03–1.11) | 1.07 (1.03–1.11) | 1.07 (1.02–1.11) | |
| Sex | Ptrend <0.001 | Ptrend <0.001 | ||
| Male# | 1.00 | 1.00 | ||
| Female | 1.30 (1.27–1.33) | 1.30 (1.27–1.33) | ||
| Race/ethnicity | Ptrend <0.001 | Ptrend <0.001 | ||
| non-Hispanic white | 1.42 (1.35–1.49) | 1.44 (1.37–1.51) | ||
| non-Hispanic black | 1.09 (1.03–1.15) | 1.09 (1.03–1.15) | ||
| Hispanic# | 1.00 | 1.00 | ||
| All other races and ethnicities | 1.19 (1.10–1.28) | 1.19 (1.10–1.29) | ||
| Age | Ptrend <0.001 | Ptrend <0.001 | ||
| 18–34 years# | 1.00 | 1.00 | ||
| 35–49 years | 1.66 (1.61–1.72) | 1.67 (1.61–1.73) | ||
| 50–64 years | 1.59 (1.53–1.65) | 1.59 (1.53–1.65) | ||
| 65 years and older | 1.12 (1.08–1.17) | 1.13 (1.08–1.18) | ||
| Education | Ptrend <0.001 | Ptrend <0.001 | ||
| <High school/GED# | 1.00 | 1.00 | ||
| High school/GED | 1.02 (0.98–1.07) | 1.02 (0.98–1.07) | ||
| Some college | 1.40 (1.33–1.46) | 1.39 (1.33–1.45) | ||
| Bachelor’s degree | 1.50 (1.42–1.57) | 1.48 (1.41–1.56) | ||
| Graduate degree | 1.68 (1.59–1.78) | 1.67 (1.57–1.77) | ||
| Poverty Status | Ptrend <0.001 | Ptrend <0.001 | ||
| Less than 100%# | 1.00 | 1.00 | ||
| 100 to less than 200% | 0.96 (0.92–1.00) | 0.96 (0.92–1.00) | ||
| 200 to less than 400% | 0.98 (0.94–1.02) | 0.98 (0.94–1.02) | ||
| 400% or greater | 1.05 (1.01–1.10) | 1.04 (1.00–1.09) | ||
|
Urban-rural classification+ |
Ptrend <0.1 | |||
| Large central metro | 0.99 (0.94–1.03) | |||
| Large fringe metro | 1.00 (0.96–1.05) | |||
| Medium metro# | 1.00 | |||
| Small metro | 0.99 (0.91–1.08) | |||
| Micropolitan | 0.92 (0.85–1.00) | |||
| Non-core | 0.89 (0.82–0.98) | |||
#
Reference Category
*
Includes sample adults 18 years and older with complete data for analytic covariates
Model 1: Unadjusted; Model 2: adjusted for gender, race/ethnicity, age, education and poverty threshold; Model 3: additionally adjusted for urban-rural classification.
^
Family income as a percent of Poverty Threshold
+
Counties were classified into urbanization levels based on the 2006 NCHS Urban-Rural Classification Scheme for Counties.
EHE95: Extreme heat events – days where the daily TMAX value exceeded the county and calendar month specific 95th percentile threshold, calculated using 30 year of baseline data.