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. Author manuscript; available in PMC: 2011 Oct 1.
Published in final edited form as: Am J Perinatol. 2011 Jun 9;28(9):735–740. doi: 10.1055/s-0031-1280853

TABLE 2.

Ultrasound characteristics of the two study groups

Resolved previa
N=324		 Unresolved previa
N=42		 p value
Type of previa
   Complete
   Marginal
203 (63)
121 (37)
40 (95)
2 (5)		 <0.01
Placental location
   Anterior
   Posterior
116 (36)
208 (64)
14 (33)
28 (67)		 0.86
Distance from os (mm) 7.7 (±15.0) 26.7 (±5.9) <0.01
Gestational age at diagnosis (weeks) 17.9 (±2.3) 22.9 (±5.9) <0.01

Data presented at number (percentage) with standard deviation where available; Fisher’s exact test used for analysis of categorical variables, Student T-test and Wilcoxon rank sum used for analysis of group means