condition mean min max ZT0-3 1.5080283865 0.855673146 2.160383627 ZT4-7 1.25063433 1.237564683 1.263703977 ZT8-11 3.747410114 1.807429515 5.687390713 ZT12-15 7.687130978 6.666849548 8.707412408 ZT16-19 5.9870725257499995 5.896523569999999 6.0776214815000005 ZT20-23 5.963162100999999 5.946581825999999 5.979742375999999