condition mean min max ZT0-3 184.756971 184.756971 184.756971 ZT4-7 273.03963350000004 273.03963350000004 273.03963350000004 ZT8-11 279.214298 279.214298 279.214298 ZT12-15 270.51866199999995 270.51866199999995 270.51866199999995 ZT16-19 332.47570900000005 332.47570900000005 332.47570900000005 ZT20-23 324.795757 324.795757 324.795757