condition mean min max ZT0-3 8.296940889750001 5.1147607095000005 11.47912107 ZT4-7 0.63767397975 0.3053944625 0.969953497 ZT8-11 0.8660544445 0.6880912185 1.0440176705 ZT12-15 1.9435396642499998 1.3240050435 2.563074285 ZT16-19 3.83354197275 3.5400145175000004 4.1270694279999995 ZT20-23 5.7959641045 5.4181481895 6.1737800195000005