. 2022 Jul 5;328(1):48–56. doi: 10.1001/jama.2022.9224

Table 3. Prevalence of Peanut Allergy by Age of Peanut Introduction.

Early peanut introduction	2018-2019 study^a		2007-2011 study peanut allergy, No./total No. (%)^a^,^b	Difference (95% CI)		P value^e
Early peanut introduction	Peanut allergy, No./total No. (%)^b	Adjusted % (95% CI)	2007-2011 study peanut allergy, No./total No. (%)^a^,^b	Unadjusted	Adjusted^c^,^d	P value^e
<12 mo	30/1099 (2.7)	1.9 (1.2 to 2.7)	24/1043 (2.3)	−0.3 (−1.7 to 1.0)	0.4 (−0.6 to 1.7)	.46
≥12 mo	13/212 (6.1)	4.8 (2.3 to 7.9)	123/3743 (3.3)	−3.0 (−6.8 to 0.2)	−1.5 (−4.6 to 1.1)	.35

^{^a}

Study years refer to years of enrollment.

^{^b}

Positive oral food challenge or a clear history of recent reaction (within the past 2 months) in infants with a skin prick test wheal of more than or equal to 1 mm.

^{^c}

The 2018-2019 study prevalence is adjusted to 2007-2011 study distribution of infant ancestry, family history of food allergy, family history of hay fever, dog ownership, number of siblings, and interactions between family history of food allergy and study.

^{^d}

Absolute difference between the adjusted 2018-2019 prevalence and 2007-2011 prevalence.

^{^e}

P value for the adjusted difference. Absolute differences were calculated from values before rounding.