nmap scan only state of port

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http://serverfault.com – Is it possible with nmap to check only the state of a port whether- open, closed or filtered and NOT the services behind it? The aim is to speed up scan results. Since UDP scan is also involved it is taking forever to complete. That aside what could be done to speed up nmap UDP scans? The one I'm using is: nmap -n -sS -sU -p1-65535 -oN scan_out -iL hosts (HowTos)