condition mean min max ZT0-3 14.811183333333332 13.88715 15.59545 ZT4-7 11.526805 11.526805 11.526805 ZT8-11 10.531555 10.531555 10.531555 ZT12-15 24.9756 24.375300000000003 25.575899999999997 ZT16-19 24.349249999999998 24.349249999999998 24.349249999999998 ZT20-23 24.988500000000002 24.988500000000002 24.988500000000002