condition mean min max ZT0-3 18.820875 18.76285 18.8789 ZT4-7 29.93805 29.93805 29.93805 ZT8-11 3.6060549999999996 3.6060549999999996 3.6060549999999996 ZT12-15 0 0 0 ZT16-19 0.4432725 0.4432725 0.4432725 ZT20-23 8.194704999999999 8.194704999999999 8.194704999999999