condition mean min max ZT0-3 1.293135 1.194635 1.391635 ZT4-7 2.287855 2.287855 2.287855 ZT8-11 1.3060999999999998 1.3060999999999998 1.3060999999999998 ZT12-15 0 0 0 ZT16-19 1.68208 1.68208 1.68208 ZT20-23 1.690405 1.690405 1.690405