Table 1 Demographics of study cohort

Vaccine responsiveness

High vaccine response

(1) 7%

(5) 31%

(6) 20%

Normal vaccine response

(6) 43%

(10) 62%

(16) 53%

Low vaccine response

(7) 50%

(1) 6%

(8) 26%

Otitis-prone status

Stringently defined otitis prone

(10) 71%

(0) 0%

(10) 33%

Non-otitis prone

(4) 29%

(16) 100%

(20) 67%

Atopy

Eczema

(4) 29%

(3) 18%

(7) 23%

Sex

Female

(3) 21%

(6) 38%

(9) 30%

Male

(11) 79%

(10) 62%

(21) 70%

Age (months)

Mean

9.9 ± 2

10.76 ± 1.59

10.36 ± 1.81

Ancestry

African-American

(0) 0%

(1) 6%

(1) 3%

Caucasian

(14) 100%

(13) 81%

(27) 90%

Other

(0) 0%

(2) 12%

(2) 7%

Daycare

Yes

(11) 79%

(8) 50%

(19) 63%

No

(3) 21%

(8) 50%

(11) 37%

Breastfeeding

Breastfed

(4) 29%

(3) 19%

(7) 23%

Formula fed

(8) 57%

(10) 62%

(18) 60%

Both

(2) 14%

(3) 19%

(5) 17%

Smokers in home

Yes

(0) 0%

(1) 6%

(1) 3%

No

(14) 100%

(15) 94%

(29) 97%

Siblings

Yes

(7) 50%

(11) 69%

(18) 60%

No

(7) 50%

(5) 31%

(12) 40%