Table 3.

Odds ratio^a for 2,4-dichlorophenol levels and asthma morbidity in wheezers, stratified by atopic^b status

Outcome	Atopicb wheezers (n=156)		Non-atopicb wheezers (n=94)
	Odds ratio (95% CI c)	p for trend	Odds ratio (95% CI)	p for trend
Asthma, diagnosed by a doctor d		0.1		0.7
Lower tertile	1.0		1.0
Mid-tertile	2.9 (0.7, 11.4)		0.8 (0.2, 3.1)
Upper tertile	4.0 (0.7, 22.9)		1.7 (0.2, 14.4)
Medications for wheezingf		0.7		0.1
Lower tertile	1.0		1.0
Mid-tertile	1.2 (0.2, 6.2)		1.9 (0.5, 7.1)
Upper tertile	1.4 (0.2, 8.6)		6.1 (0.6, 57.4)
Missing work or school due to wheezinge		<0.01		0.9
Lower tertile	1.0		1.0
Mid-tertile	4.8 (1.4, 16.5)		1.2 (0.4, 3.5)
Upper tertile	11.4 (2.5, 52.9)		1.0 (0.2, 4.8)
Wheezing during exercise g		0.3		0.4
Lower tertile	1.0		1.0
Mid-tertile	2.5 (0.6, 10.2)		2.7 (0.8, 9.6)
Upper tertile	1.7 (0.6, 4.6)		1.3 (0.2, 7.1)

^aAll estimates are weighted to the sampling weights

^bAtopy was defined as the presence of allergen specific IgE ≥0.35 kU/L to at least one environmental and/ or food allergen

^c95% CI – 95% confidence interval

^dAsthma was defined by the answer to the question: “Has a doctor or other health professional ever told that (you have/s/he/survey participant (SP) has) asthma?”

^eDuring the past 12 months, did (you/ study participant) miss any days of work or school due to wheezing or whistling?

^fIn the past 12 months, (have you/ has study participant) taken medication, prescribed by a doctor, for wheezing or whistling?

^gIn the past 12 months has (your/ study participant’s) chest sounded wheezy during or after exercise or physical activity?

Results were adjusted for sample weights, urine creatinine, age, gender, race, and poverty-income ratio.

Values in bold are statistically significant.