Table 5.

Association between allergic disease, anaemia, adiposity and ADD/ADHD in children with eczema (n = 35 865)

Variable	ADD/ADHD
	No (n = 32 504)	Yes (n = 3361)
	Freq	Freq	% Prev (95% CI)	Crude OR (95% CI)	Adjusted OR (95% CI)
Anaemia
No	15 291	1505	9·0 (8·5–9·4)	1·00 (ref)	1·00 (ref)
Yes	384	68	15·0 (11·7–18·3)	1·80 (1·38–2·34)	1·84 (1·37–2·46)
Headaches
No	24 893	2646	9·6 (9·3–10·0)	1·00 (ref)	1·00 (ref)
Yes	2656	626	19·0 (17·7–20·4)	2·22 (2·02–2·44)	1·66 (1·49–1·85)
Body mass index (percentile)
< 5	356	77	17·8 (14·2–21·4)	1·38 (1·07–1·78)	1·20 (0·87–1·64)
5–84	5591	878	13·6 (12·7–14·4)	1·00 (ref) 1·00 (ref)
85–94	1560	277	15·1 (13·4–16·7)	1·13 (0·98–1·31)	1·10 (0·92–1·30)
≥ 95	1485	366	19·8 (18·0–21·6)	1·57 (1·37–1·80)	1·28 (1·08–1·50)

Binary, unweighted logistic regression models were constructed with ADD/ADHD as the dependent variable and history of allergic disease, anaemia and body mass index for age and sex percentiles as the independent variables. Analyses were limited to subjects with a history of eczema. Multivariate logistic regression models were then constructed that included sex, age, race, household income, highest level of household education, U.S. vs. foreign birthplace and insurance coverage as the independent variables. Crude and adjusted prevalence ORs and 95% CIs were estimated. ADD/ADHD, attention deficit (hyperactivity) disorder; CI, confidence interval; freq, frequency; OR, odds ratio; prev, prevalence; bold indicates significance.