Fig. 2From: Epidemiological characteristics and risk factors of obstetric infection after the Universal Two-Child Policy in North China: a 5-year retrospective study based on 268,311 casesDistribution of obstetric infection areas before and after the Universal Two-Child Policy. The data filled in the white box and the gray box are the obstetric infection rate of each city before and after the Universal Two-Child Policy, respectivelyBack to article page