As it's written on the page, non-party related NPCs/monsters follow the table equal to their CR, so it would also be applied to summoned monsters. It's also written on there that animal companions are treated the effective level of their masters for the purpose of the table. It stops them from falling behind too far at higher levels, and balances out since enemies also get the benefit of the table and stops you from needing to outfit them with various trinkets.<br/><br/>That's been one of the most recent additions to the system, so I haven't seen it in action yet.