condition mean min max ZT0-3 9.367560000000001 9.367560000000001 9.367560000000001 ZT4-7 1.65522 1.65522 1.65522 ZT8-11 2.62338 2.62338 2.62338 ZT12-15 12.97505 12.97505 12.97505 ZT16-19 20.341450000000002 20.341450000000002 20.341450000000002 ZT20-23 18.9535 18.9535 18.9535