condition mean min max ZT0-3 23.649303 23.649303 23.649303 ZT4-7 71.14345 71.14345 71.14345 ZT8-11 99.807563 99.807563 99.807563 ZT12-15 35.643425 35.643425 35.643425 ZT16-19 43.6007005 43.6007005 43.6007005 ZT20-23 27.3236035 27.3236035 27.3236035