condition mean min max ZT0-3 5.223599999999999 5.223599999999999 5.223599999999999 ZT4-7 8.727715 8.727715 8.727715 ZT8-11 9.824285 9.824285 9.824285 ZT12-15 10.193249999999999 10.193249999999999 10.193249999999999 ZT16-19 9.22982 9.22982 9.22982 ZT20-23 5.29768 5.29768 5.29768