Women randomized to the intervention group also had higher knowledge scores ( @ vs @ on a @-point scale ; mean group difference , @ -LSB- @ % CI , @-@ @ -RSB- ) and were more likely to correctly estimate the amniocentesis-related miscarriage risk ( @ % vs @ % ; OR , @ -LSB- @ % CI , @-@ @ -RSB- ) and their estimated age-adjusted chance of carrying a fetus with trisomy @ ( @ % vs @ % ; OR , @ -LSB- @ % CI , @-@ @ -RSB- ) .