Additional file 1: of The effect of breastfeeding on the risk of asthma in high-risk children: a case-control study in Shanghai, China

Table S1. Characteristics of the mothers and children compared between participations and non-participations. Table S2. Characteristics of the mothers and children compared between participations and non-participations. If the variable had missing data, the comparation was examined between the mothers or children who had information. (DOCX 20 kb)