condition mean min max ZT0-3 5.326280000000001 5.326280000000001 5.326280000000001 ZT4-7 2.327085 2.327085 2.327085 ZT8-11 5.28006 5.28006 5.28006 ZT12-15 6.37906 6.37906 6.37906 ZT16-19 10.883849999999999 10.883849999999999 10.883849999999999 ZT20-23 7.185925 7.185925 7.185925