condition mean min max ZT0-3 5.485391060333334 4.044895697 6.925886423666667 ZT4-7 9.8863586525 8.254161456 11.518555849 ZT8-11 6.371335018833333 5.331809213 7.410860824666667 ZT12-15 5.4607470535000004 5.043451859 5.878042248 ZT16-19 9.082269218166665 4.790081022000001 13.374457414333332 ZT20-23 13.150617540499999 10.308063792666665 15.993171288333333