condition mean min max ZT0-3 0.0098288 0.0098288 0.0098288 ZT4-7 0.021574 0.021574 0.021574 ZT8-11 0.045408550000000006 0.045408550000000006 0.045408550000000006 ZT12-15 0.02381735 0.02381735 0.02381735 ZT16-19 0.0606102 0.0606102 0.0606102 ZT20-23 0.0387141 0.0387141 0.0387141