condition mean min max ZT0-3 2.8954699999999995 2.8782949999999996 2.912645 ZT4-7 1.6154600000000001 1.6154600000000001 1.6154600000000001 ZT8-11 2.121125 2.121125 2.121125 ZT12-15 0 0 0 ZT16-19 3.02402 3.02402 3.02402 ZT20-23 0.95544 0.95544 0.95544