Equalizing Agent and Master Nagios on state change alone

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http://serverfault.com – We have a setup where there are distributed Nagios running on multiple sites and are equalizing their data to the main Nagios server. The problem is it sends back the data to main Nagios server no matter if there is a state change in host or service. Is it possible to configure the slave Nagios to check the service/Host every 5 sec but send back the data only if there is a state change. Currently it is implemented by Obsess Over Hosts/Service which always runs the command which will equalize. Nagios version is 3 I am no administrator but a developer so I don't know the exact jargon so ple (HowTos)