condition mean min max ZT0-3 2.5068375 2.0099 3.003775 ZT4-7 3.57301 3.57301 3.57301 ZT8-11 6.986715 6.986715 6.986715 ZT12-15 0 0 0 ZT16-19 5.109025 5.109025 5.109025 ZT20-23 3.63145 3.63145 3.63145