condition mean min max ZT0-3 724.895777 724.895777 724.895777 ZT4-7 739.5561339999999 739.5561339999999 739.5561339999999 ZT8-11 772.308902 772.308902 772.308902 ZT12-15 899.314107 899.314107 899.314107 ZT16-19 1306.5211235 1306.5211235 1306.5211235 ZT20-23 1725.5534105 1725.5534105 1725.5534105