Pinging an address on OS X vs Windows

I'm trying to diagnose an issue with my WiFi router. Firstly I tried pinging my MacBook, and the results were pretty bad. Average around 30ms. Then I tried it on my Windows 7 notebook and the results were around 1ms.

However I noticed that OS X pings 64 bytes, where as Windows 7 pings 32 bytes. Does this in any way make the results incomparable? If yes, is there any way to ping 32 bytes on OS X?