Table 4.

Cohort description.

Categorical variables
Descriptive variable	N	%	Descriptive variable	N	%
Sex			Formula Feeding at 6 Mo.
Male	23	67.6	Yes	15	46.9
Female	11	32.4	No	17	53.1
Income			Cereals at 6 Mo.
High	13	38.2	Yes	20	74.1
Middle	13	38.2	No	7	25.9
Low	8	23.5	Breastfeeding at 1 Year
Maternal race			Yes	15	50.0
White	26	76.5	No	15	50.0
Black	8	23.5	Formula Feeding at 1 Year
Paternal Race			Yes	13	43.3
White	27	79.4	No	17	56.7
Black	7	20.6	Nuts at 1 Year
Maternal Pre-Pregnancy BMI			Yes	20	66.7
Under	1	2.9	No	10	33.3
Normal	25	73.5	Sweet Foods/Drinks at 1 Year
Overweight	6	17.6	Yes	21	70.0
Obese	2	5.9	No	9	30.0
Maternal Infection During Pregnancy			French Fries at 1 Year
Yes	11	32.4	Yes	18	60.0
No	23	67.6	No	12	40.0
Maternal Psychiatric History			Milks at 1 Year
Yes	9	26.5	Yes	23	76.7
No	25	73.5	No	7	23.3
Older Siblings			Antibiotic Usage in First Year
Yes	20	58.8	Yes	13	43.3
No	14	41.2	No	17	56.7
Vitamin D at 1 Mo.			Daycare Attendance
Yes	13	38.2	Yes	9	34.6
No	21	61.8	No	17	65.4
Vitamin D at 6 Mo.			Fever in Last 2 Weeks at 1 Year
Yes	8	28.6	Yes	8	26.7
No	20	71.4	No	22	73.3
Continuous Variables
Descriptive Variable	N	Mean ± SD	Descriptive Variable	N	Mean ± SD
Gestational Age at Birth (days)	34	275.5 ± 7.6	Age at Visit 2 (days)	31	387 ± 37.6
Birth Weight (grams)	34	3330 ± 397	Month Food Introduceda	32	5.6 ± 1.9
Maternal Age at Birth (years)	34	30.3 ± 4.8	Maternal State Anxietyb	27	32.3 ± 10.9
Maternal Education (years)	34	16 ± 2.2	Maternal Trait Anxietyb	27	31.9 ± 8.3
Paternal Age at Birth (years)	34	32.6 ± 6.9	Negative Life Eventsc	27	3.6 ± 5.4
Paternal Education (years)	34	15.8 ± 2.8	Positive Life Eventsc	27	5.4 ± 5.2
Age at Visit 1 (days)	32	30.2 ± 10.8	Total Life Eventsc	27	9.0 ± 6.6

All socioeconomic characteristics are based on maternal report.

^aIntroduction of food other than breastmilk or formula.

^bState-Trait Anxiety Inventory for Adults⁸⁷.

^cLife Experiences Survey⁸⁸.