condition mean min max ZT0-3 48.10608333333333 39.33365 65.53975 ZT4-7 68.15005 68.15005 68.15005 ZT8-11 37.1967 37.1967 37.1967 ZT12-15 60.719350000000006 59.2892 62.1495 ZT16-19 38.8296 38.8296 38.8296 ZT20-23 38.1426 38.1426 38.1426