condition mean min max ZT0-3 314.78084 314.78084 314.78084 ZT4-7 325.8517325 325.8517325 325.8517325 ZT8-11 321.99431849999996 321.99431849999996 321.99431849999996 ZT12-15 401.048365 401.048365 401.048365 ZT16-19 367.211826 367.211826 367.211826 ZT20-23 371.953748 371.953748 371.953748