condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0204308625 0.015034625 0.025827100000000002 ZT16-19 0.009486516666666667 0.0 0.018973033333333333 ZT20-23 0 0 0