Study (year) | Total loss rate, percent | Difference, percent | Relative risk (95% CI) | |
CVS | Amniocentesis | |||
MRC (1991) | 13.7 (220/1609) | 9.0 (144/1592) | 4.6 | 1.5 (1.2-1.8) |
Smidt-Jensen (1992) | 9.1 (195/2144) | 7.0 (81/1158) | 2.1 | 1.3 (1.1-1.7) |
Overall | 11.06 | 8.18 | 2.9 | 1.4 (1.2-1.6) |
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