Fig. 3

Relationship between obstetric factors and doubling time. a Doubling time was calculated at passage 1 (P1). Bivariate regression showed an impact of managed labor, which decreased P1 doubling time. Multivariate regression showed an impact of oxytocin infusion, decreasing doubling time. Occurrence of these two obstetric factors during labor is positive for cell proliferation. b Doubling time was calculated at P2. Bivariate regression showed a positive impact of full-term birth and maternal smoking and a negative impact of neonate disorders and preeclampsia. *p ≤ 0.05 after bivariate regression analysis; **p ≤ 0.05 after multivariate regression analysis