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] |