condition mean min max ZT0-3 85.549631 85.549631 85.549631 ZT4-7 97.0638505 97.0638505 97.0638505 ZT8-11 103.620409 103.620409 103.620409 ZT12-15 114.8470525 114.8470525 114.8470525 ZT16-19 131.605861 131.605861 131.605861 ZT20-23 161.36855450000002 161.36855450000002 161.36855450000002