condition mean min max ZT0-3 12.2535975 10.8564 13.650794999999999 ZT4-7 30.2072 30.2072 30.2072 ZT8-11 14.697 14.697 14.697 ZT12-15 0 0 0 ZT16-19 15.4708 15.4708 15.4708 ZT20-23 25.17395 25.17395 25.17395