condition mean min max ZT0-3 1440.655134 1440.655134 1440.655134 ZT4-7 599.4584675 599.4584675 599.4584675 ZT8-11 682.5141625 682.5141625 682.5141625 ZT12-15 817.2560435 817.2560435 817.2560435 ZT16-19 807.2076765 807.2076765 807.2076765 ZT20-23 1013.3980885 1013.3980885 1013.3980885