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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Obstet Gynecol. 2011 Feb;117(2 Pt 1):343–348. doi: 10.1097/AOG.0b013e31820776fd

Table 5.

Risk of Failed VBAC for Patients by Incremental Increases in Birth Weight Difference

Failed VBAC
(n, %)		 RR
(95% CI)		 AOR
(95% CI)
0-100g
(n = 119)		 49
(41.2)		 Ref Ref
101-250g
(n = 148)		 80
(54.1)		 1.3
(1.0-1.7)		 1.7*
(1.1-2.9)
251-500g
(n = 169)		 89
(52.7)		 1.3
(1.0-1.7)		 1.5†
(0.9-2.5)
501-750g
(n =105)		 56
(53.3)		 1.3
(1.0-1.7)		 1.6*
(0.9-2.7)
751-1000g
(n = 37)		 25
(67.6)		 1.6
(1.2-2.2)		 3.1*
(1.4-6.8)
>1000g
(n = 25)		 14
(56.0)		 1.4
(0.9-2.0)		 1.9*
(0.8-4.6)
*

Adjusted for prior vaginal delivery

†

Adjusted for prior vaginal delivery and diabetes