condition mean min max ZT0-3 454.073049 454.073049 454.073049 ZT4-7 236.03874299999998 236.03874299999998 236.03874299999998 ZT8-11 234.70304499999997 234.70304499999997 234.70304499999997 ZT12-15 426.7243525 426.7243525 426.7243525 ZT16-19 408.34094400000004 408.34094400000004 408.34094400000004 ZT20-23 588.3772735 588.3772735 588.3772735