condition mean min max ZT0-3 4.478034833500001 4.198917509 4.757152158 ZT4-7 4.447026571 3.9308003960000004 4.963252746 ZT8-11 4.91799902125 4.6730797575 5.162918285 ZT12-15 7.8350973195 6.8596917765 8.8105028625 ZT16-19 11.46493296925 9.7124179035 13.217448035 ZT20-23 23.9567674475 17.268533405 30.64500149