condition mean min max ZT0-3 3434.226217 3434.226217 3434.226217 ZT4-7 3646.334375 3646.334375 3646.334375 ZT8-11 2843.745435 2843.745435 2843.745435 ZT12-15 3220.409504 3220.409504 3220.409504 ZT16-19 2703.4168795 2703.4168795 2703.4168795 ZT20-23 2581.5777735 2581.5777735 2581.5777735