Assertion: vasectomy's failure rate | /r/DefinedAs | patient
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Source sentences:
text: PVSAs were obtained on 41,814 patients and revealed 267 early failures (a failure rate of 0.64%) defined as patients whose PVSAs continued to show the presence of sperm and required reoperation.29 Failure rates ranged from 0.28% to 1.3% across centers that used this method.