condition mean min max ZT0-3 0.46415833333333334 0.1315545 0.9430385 ZT4-7 1.8299249999999998 1.8299249999999998 1.8299249999999998 ZT8-11 0.6777575 0.6777575 0.6777575 ZT12-15 1.6010825 0.241205 2.96096 ZT16-19 1.2069935 1.2069935 1.2069935 ZT20-23 0.0 0.0 0.0