I'd be inclined to say it's "junk science", in that the "study" in question deliberately didn't control for OTHER factors affecting the rate of birth defects. For example, the older the mother, the higher the chance of birth defects. Odds are that a woman who has an abortion will have her first live birth later in life than a woman who doesn't. Also, there's probably some correleation between lifestyle factors that can cause birth defects (drinking, for one) and a woman's likelihood to abort an unplanned pregnancy rather than carry it to term.
A while back, there was a "study" that linked abortion to breast cancer. On the other hand, it's known that the longer breast tissue is in a "half-developed" stage (first level of maturation is at puberty, second is toward the end of a woman's first full-term pregnancy when it's "gearing up" to produce milk), the higher the risk of cancer. Again, aborting an early-in-life pregnancy will result in the first full-term pregnancy being at an older age than not getting the abortion. Using the same "logic" as that study, it can be shown that joining a convent (nuns take a vow of celebacy, and are therefore extremely unlikely to ever get pregnant) causes breast cancer.
A while back, there was a "study" that linked abortion to breast cancer. On the other hand, it's known that the longer breast tissue is in a "half-developed" stage (first level of maturation is at puberty, second is toward the end of a woman's first full-term pregnancy when it's "gearing up" to produce milk), the higher the risk of cancer. Again, aborting an early-in-life pregnancy will result in the first full-term pregnancy being at an older age than not getting the abortion. Using the same "logic" as that study, it can be shown that joining a convent (nuns take a vow of celebacy, and are therefore extremely unlikely to ever get pregnant) causes breast cancer.
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