condition mean min max ZT0-3 0.0387885 0.0387885 0.0387885 ZT4-7 0.021690249999999998 0.021690249999999998 0.021690249999999998 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0