condition mean min max ZT0-3 1.2202550162499999 1.0801306309999998 1.3603794015000001 ZT4-7 2.05898458275 2.0524317095 2.065537456 ZT8-11 2.799593809 2.289937251 3.3092503669999997 ZT12-15 3.44579386525 3.3589079340000003 3.5326797965 ZT16-19 2.99853286275 2.9134354484999996 3.083630277 ZT20-23 4.10078667925 3.8264877055 4.375085652999999