condition mean min max ZT0-3 56.571354 56.571354 56.571354 ZT4-7 38.343399000000005 38.343399000000005 38.343399000000005 ZT8-11 23.748205499999997 23.748205499999997 23.748205499999997 ZT12-15 33.927218 33.927218 33.927218 ZT16-19 20.170229499999998 20.170229499999998 20.170229499999998 ZT20-23 18.936282499999997 18.936282499999997 18.936282499999997