condition mean min max ZT0-3 1.1309475515 0.556347305 1.705547798 ZT4-7 4.435805703750001 3.7678988139999996 5.103712593500001 ZT8-11 7.83518107375 7.2890458375 8.38131631 ZT12-15 9.61224210725 9.4801779885 9.744306225999999 ZT16-19 8.657599379 8.039029955 9.276168803000001 ZT20-23 10.1670792285 9.743056287 10.59110217