Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Semen analysis cohort inclusion criteria. Sample selection for the men with semen analysis. Matched fertile control subjects were selected for the final samples: 12,889 for the first-degree relative (FDR) analysis and 8,032 for the second-degree relative (SDR) analysis. Total number of FDRs and SDRs for men with semen analysis and their matched control subjects by relationship type. Total numbers of first- and second-degree relatives equal 130,689 and 247,204, respectively.
