The percentage range for the yellow designation may seem large but is actually fairly small in terms of the number of IPs that fall into this range relative to the other two. Unfortunately, since SNDS is available to anyone who can prove they own an IP range, this is a case where we must be careful not to provide too much data that might assist spammers. One trick however, when viewing data for a number of IPs, is that it can often be enlightening to consider the non-yellow IPs: if they're green, the yellow results are most likely very close to the 10% end. Similarly, if the majority of the other IPs are red, the yellows probably represent results near 90%. The same technique can be applied when looking at one IP's history.
Please keep in mind that this result doesn't directly represent deliveries to users' inboxes or "Junk e-mail" folders. Settings controlled by each user might rescue some legitimate traffic from being put in the "Junk e-mail" folder, or conversely, might treat other messages more harshly. It doesn't take into account messages that might have been caught but weren't because they were on a user's safelist, for example.