condition mean min max ZT0-3 6.42798 6.42798 6.42798 ZT4-7 4.202395 4.202395 4.202395 ZT8-11 5.237439999999999 5.237439999999999 5.237439999999999 ZT12-15 7.304015 7.304015 7.304015 ZT16-19 9.991363333333334 9.991363333333334 9.991363333333334 ZT20-23 9.75114 9.75114 9.75114