Figure 2.

Association between universal two-child policy and early-term birth (ETB) in women without previous uterine scars when not adjusting other variables (A), without previous uterine scars when adjusting other variables (B), with previous uterine scars when not adjusting other variables (C), with previous uterine scars when adjusting other variables (D), by maternal age group (n=28 966). The association between universal two-child policy and ETB when stratified by age ×previous uterine scars. RR, relative risk. *p<0.05,**p<0.01