condition mean min max ZT0-3 21.541249999999998 20.0219 23.0606 ZT4-7 12.238199999999999 12.238199999999999 12.238199999999999 ZT8-11 8.688005 8.688005 8.688005 ZT12-15 0 0 0 ZT16-19 12.9269 12.9269 12.9269 ZT20-23 14.3113 14.3113 14.3113