condition mean min max ZT0-3 4.294382499999999 4.27959 4.309175 ZT4-7 4.38125 4.38125 4.38125 ZT8-11 6.5679300000000005 6.5679300000000005 6.5679300000000005 ZT12-15 0 0 0 ZT16-19 7.816515 7.816515 7.816515 ZT20-23 5.81393 5.81393 5.81393