condition mean min max ZT0-3 3.9273546775000003 3.085587745 4.76912161 ZT4-7 6.6826585102500005 5.076202054 8.2891149665 ZT8-11 4.22011421725 2.358255954 6.0819724805 ZT12-15 4.292201408 3.1626567495 5.4217460665 ZT16-19 12.27131393825 10.7035646365 13.839063240000002 ZT20-23 14.5841657 12.74472542 16.42360598