condition mean min max ZT0-3 558.55607 558.55607 558.55607 ZT4-7 463.36513849999994 463.36513849999994 463.36513849999994 ZT8-11 636.3361395 636.3361395 636.3361395 ZT12-15 936.6584925 936.6584925 936.6584925 ZT16-19 889.2435399999999 889.2435399999999 889.2435399999999 ZT20-23 1090.4478475 1090.4478475 1090.4478475