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.
Periods: 1 = 0–20 min, 2 = 21–40 min, 3 = 41–60 min, 4 = 61–90 min, 5 = 91–120 min. Percentiles: p5;p10;p25;p50;mean;p75;p90;p95.
