. Author manuscript; available in PMC: 2013 Jul 12.

Published in final edited form as: Obstet Gynecol. 2013 Apr;121(4):798–804. doi: 10.1097/AOG.0b013e3182860b8d

Table 2.

Primary and Secondary Outcomes Stratified by Randomization Groups

Outcome	Deferred Scan (n=167)	Immediate Scan (n=168)	Risk Ratio (95% CI)	P
Focal myometrial contraction	47 (28.1)	68 (40.5)	0.70 (0.52–0.93)	.02
Inadequate images	31 (18.6)	53 (31.5)	0.59 (0.40–0.86)	.006
Inadequate images without focal myometrial contraction	2 (1.2)	4 (2.4)	0.50 (0.09–2.70)	.42
Inadequate images and focal myometrial contraction	29 (17.4)	49 (29.2)	0.60 (0.40–0.89)	.01
Placenta previa	22 (13.2)	33 (19.6)	0.67 (0.40–1.13)	.13
Placenta previa without focal myometrial contraction	17 (10.2)	12 (7.1)	1.4 (0.76–2.7)	.27
Placenta previa and focal myometrial contraction	5 (3.0)	21 (12.5)	0.24 (0.09–0.62)	.003

CI, confidence interval.

Data are n (%) unless otherwise specified.