Sometimes people mess up translations.
Maybe it’s the gutteral sounds of German.
Medline incorrectly got the lower bound of chronic pain post vasectomy as 0.5% when it should be 3%. Here’s the correction I’ve filed with Pubmed and the original full text (in German).
PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/21845426
You can find the data in Table 2.
TITLE: Ischemic testicular necrosis following vasectomy: rare and typical complications of an outpatient procedure
PUBLISHER: Urologe A
TEXT: Late complications are chronic pain (0.5-18%), pain during sex (2.9%), hydrocele (0-4%) as well as spermatocele (1.6%)
CORRECTION: Late complications are chronic pain (3-18%), pain during sex (2.9-5%), hydrocele (0-4%) as well as spermatocele (1.6%)
NOTE: The data in question is in Table 2 on the fourth page. I’ve attached the article for your reference.