condition mean min max ZT0-3 532.036919 532.036919 532.036919 ZT4-7 634.6071039999999 634.6071039999999 634.6071039999999 ZT8-11 601.4626945 601.4626945 601.4626945 ZT12-15 536.3344825 536.3344825 536.3344825 ZT16-19 443.4744875 443.4744875 443.4744875 ZT20-23 483.7665115 483.7665115 483.7665115