# Table 2 Durations of labor

total VBAC group (n = 139) VBAC group A (n = 109) VBAC group B (n = 30) Primipara Control group (n = 149) Multipara Control group (n = 155) P values
pa pb pc pd pe
The first stage of labor (min) 390 (240, 660) 405 (242, 657) 304 (240, 770) 630 (377, 847.5) 380 (260, 530) 0.001 0.378 0.001 0.764 0.411
The second stage of labor (min) 39 (15, 83) 39 (14, 77) 48 (26, 98) 72 (42, 113.5) 15 (9, 43) 0.001 0.001 0.001 0.001 0.206
The third stage of labor (min) 5 (4, 7) 5 (4, 7) 5 (3, 6) 5 (4, 8) 6 (5, 10) 0.378 0.001 0.671 0.002 0.283
The total stage of labor (min) 453 (267, 739) 479 (268, 733) 404 (264, 801) 703 (472, 941.5) 435 (280, 600) 0.001 0.230 0.001 0.895 0.610
1. The comparisons of durations of labor were without normal distribution and were conducted by Mann–Whitney U test
2. Data are given as median (interquartile range, IQR)
3. a The comparison between total VBAC group and Primipara Control group
4. b The comparison between total VBAC group and Multipara Control group
5. c The comparison between VBAC group A and Primipara Control group
6. d The comparison between VBAC group B and Multipara Control group
7. e The comparison between VBAC group A and VBAC group B 