condition mean min max ZT0-3 4.0259350000000005 3.73848 4.303065 ZT4-7 2.63319 2.63319 2.63319 ZT8-11 0.7052055 0.7052055 0.7052055 ZT12-15 1.3544999999999998 1.2330999999999999 1.4759 ZT16-19 1.383815 1.383815 1.383815 ZT20-23 2.0471649999999997 2.0471649999999997 2.0471649999999997