condition mean min max ZT0-3 10.25967 9.21939 11.299949999999999 ZT4-7 20.896700000000003 20.896700000000003 20.896700000000003 ZT8-11 18.2023 18.2023 18.2023 ZT12-15 0 0 0 ZT16-19 17.009149999999998 17.009149999999998 17.009149999999998 ZT20-23 16.16515 16.16515 16.16515