the time of the abortion had little effect : the relative risk estimates were 0.9 ( 95 % ci 0.5-1.4 ) for induced abortion before the first term birth , 1.4 ( 95 % ci 1.0-1.9 ) for induced abortion first occurring after the first term birth , 0.9 ( 95 % ci 0.7-1.2 ) for spontaneous abortion before the first term birth , and 0.9 ( 95 % ci 0.7-1.0 ) for spontaneous abortion first occurring after the first term birth .
C0156543
abortion
C0000786
spontaneous