condition mean min max ZT0-3 753.9955844 748.5716934999999 759.4194753 ZT4-7 608.572750275 564.0081336999999 653.13736685 ZT8-11 350.2083341 256.4820145 443.9346537 ZT12-15 89.451335485 73.84539429 105.05727668 ZT16-19 116.667738945 114.11931584 119.21616205000001 ZT20-23 112.03405665 108.6723456 115.3957677