[Risk factors for cow's milk protein allergy in infants: a multicenter prospective nested case-control study].

OBJECTIVES: To explore the risk factors associated with cow's milk protein allergy (CMPA) in infants.

METHODS: This study was a multicenter prospective nested case-control study conducted in seven medical centers in Beijing, China. Infants aged 0-12 months were included, with 200 cases of CMPA infants and 799 control infants without CMPA. Univariate and multivariate logistic regression analyses were used to investigate the risk factors for the occurrence of CMPA.

RESULTS: Univariate logistic regression analysis showed that preterm birth, low birth weight, birth from the first pregnancy, firstborn, spring birth, summer birth, mixed/artificial feeding, and parental history of allergic diseases were associated with an increased risk of CMPA in infants ( P <0.05). Multivariate logistic regression analysis revealed that firstborn ( OR =1.89, 95% CI : 1.14-3.13), spring birth ( OR =3.42, 95% CI : 1.70-6.58), summer birth ( OR =2.29, 95% CI : 1.22-4.27), mixed/artificial feeding ( OR =1.57, 95% CI : 1.10-2.26), parental history of allergies ( OR =2.13, 95% CI : 1.51-3.02), and both parents having allergies ( OR =3.15, 95% CI : 1.78-5.56) were risk factors for CMPA in infants ( P <0.05).

CONCLUSIONS: Firstborn, spring birth, summer birth, mixed/artificial feeding, and a family history of allergies are associated with an increased risk of CMPA in infants.