condition mean min max ZT0-3 141.986765 141.986765 141.986765 ZT4-7 553.268872 553.268872 553.268872 ZT8-11 654.7179715 654.7179715 654.7179715 ZT12-15 354.97733400000004 354.97733400000004 354.97733400000004 ZT16-19 279.2820765 279.2820765 279.2820765 ZT20-23 222.453066 222.453066 222.453066