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. Author manuscript; available in PMC: 2014 Sep 23.
Published in final edited form as: Cochrane Database Syst Rev. 2003;(3):CD003252. doi: 10.1002/14651858.CD003252

Comparison 6.

Ultrasound versus no ultrasound before second trimester amniocentesis

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
2 Sampling failure 1 223 Risk Ratio (M-H, Fixed, 95% CI) 10.90 [0.61, 194.85]
3 Multiple insertions 1 223 Risk Ratio (M-H, Fixed, 95% CI) 0.67 [0.41, 1.09]
20 All known pregnancy loss (including termination of pregnancy) 1 223 Risk Ratio (M-H, Fixed, 95% CI) 0.33 [0.01, 8.02]
24 Spontaneous miscarriage 1 223 Risk Ratio (M-H, Fixed, 95% CI) 0.33 [0.01, 8.02]
25 Spontaneous miscarriage after test 1 223 Risk Ratio (M-H, Fixed, 95% CI) 0.33 [0.01, 8.02]
38 Bloody tap (not prespecified) 1 223 Odds Ratio (M-H, Fixed, 95% CI) 2.03 [0.86, 4.77]