condition mean min max ZT0-3 87.98515 87.98515 87.98515 ZT4-7 94.5214 94.5214 94.5214 ZT8-11 56.97665 56.97665 56.97665 ZT12-15 56.0391 56.0391 56.0391 ZT16-19 44.40645 44.40645 44.40645 ZT20-23 57.17035 57.17035 57.17035