condition mean min max ZT0-3 0.021925216666666664 0.0203092 0.02354123333333333 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0053612875 0.0 0.010722575 ZT16-19 0.02402605 0.0 0.0480521 ZT20-23 0 0 0