condition mean min max ZT0-3 3.8467814777499996 2.897948033 4.7956149224999995 ZT4-7 1.62150623375 1.0453640215 2.197648446 ZT8-11 0.9610967735 0.619988729 1.3022048179999999 ZT12-15 1.56638182325 1.2178309834999999 1.914932663 ZT16-19 1.138475218 0.993435562 1.2835148739999998 ZT20-23 0.5261745665 0.277611867 0.774737266