Table 1.

Demographic Characteristics of Study Population in NHANES III and NHANES 2005–2006

Characteristic	NHANES III Percentage (95% CI) (n = 4995)	NHANES 2005–2006 Percentage (95% CI) (n = 2901)	p value†
Age (y)
6–10	33 (30 – 35)	34 (30 – 38)	0.52
11–15	38 (36 – 41)	36 (34 – 39)	0.95
16–19	29 (26 – 32)	30 (26 – 33)	0.98
Sex
Female	49 (47 – 52)	49 (46 – 51)	0.75
Race/Ethnicity
Non-Hispanic White	66 (62 – 70)	64 (57 – 71)	0.55
Non-Hispanic Black	15 (13 – 17)	15 (9 – 21)	0.94
Mexican-American	9 (7 – 11)	13 (10 – 17)	0.01
Other	10 (7 – 13)	8 (4 – 11)	0.26
Poverty Income Ratio (PIR)
≤1.0	23 (20 – 26)	19 (16 – 23)	0.09
Allergic Outcomes
Asthma	11 (9 – 13)	17 (16 – 19)	<0.001
Allergic Rhinitis	8 (7 – 10)	5 (3 – 6)	0.001

Values are reported as percentages (95% CIs)

^†P value for the risk difference estimate