condition mean min max ZT0-3 1.8569032349999999 1.62794808 2.08585839 ZT4-7 10.9658194625 3.988622502 17.943016423 ZT8-11 67.1150947775 42.57228379 91.65790576500001 ZT12-15 62.8553061025 49.229574035 76.48103817 ZT16-19 33.3484375125 23.986115165 42.71075986 ZT20-23 10.7623661575 8.11520572 13.409526594999999