condition mean min max ZT0-3 0.06046591666666667 0.0561595 0.06477233333333333 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.014117875 0.0 0.02823575 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0