condition mean min max ZT0-3 9.520132499999999 9.261645 9.77862 ZT4-7 6.75216 6.75216 6.75216 ZT8-11 3.115045 3.115045 3.115045 ZT12-15 0 0 0 ZT16-19 4.5746400000000005 4.5746400000000005 4.5746400000000005 ZT20-23 8.146239999999999 8.146239999999999 8.146239999999999