Table 1.

Characteristics of study population

Characteristic	Controls n=121 % or mean; std	Cases n=127 % or mean
Age at enrollment (mean yrs.; std)	13.8; 2.8	10.6; 3.8
Sex (% male)	52.1	80.3
Atopic illnesses (%)
Food allergies	12.4	83.3
Environmental allergies	42.2	69.3
Antibiotic allergies	14.5	25.8
Eczema	21.5	59.1
Asthma	18.2	44.9
Maternal marital status (%)
Married or civil union	93.4	94.4
Single	6.6	5.6
Maternal education (%)
<HS*	0	2.4
HS or GED**	17.4	11.8
Technical or associates	21.5	18.9
Bachelor’s	40.5	37.0
Graduate or professional	20.7	29.9

^*HS=High School

^**GED=General Education Development test certification