The way we do it is correct the minima after taking into consideration the MOC( minimum obstacle clearance) .Basically if the change is greater than 20% then you have to apply it. For example on departure the MOC is 35ft. So if the temperature correction table shows a correction greater than 7ft you have to apply it. For an ILS approach the MOC is 150 ft so if the table shows a correction greater than 30 ft again you have to apply it. The table is temperature against height above a/f elevation.
I hope that helps