Fig. 2From: Association of China’s two-child policy with changes in number of births and birth defects rate, 2008–2017The estimated number of monthly births if the two-child policy had not been implemented. The purple line was the monthly number of nulliparous births; the yellow line was the monthly number of multiparous birth; the grey dashed line was the estimated number of multiparous birth if the two-child policy had not been implemented (For births with Shanghai and non-Shanghai household registration, the coefficients of parity*universal two-child policy was zero in the difference-in-difference model; For births with Shanghai household registration, the coefficients of parity*partial two-child policy and parity*universal two-child policy were zero); The area of the grey shading was estimated extra births during to China’s policy changeBack to article page