condition mean min max ZT0-3 22.561790502500003 20.114930335 25.00865067 ZT4-7 21.3699200875 16.702489325000002 26.03735085 ZT8-11 40.9432677425 31.945896335 49.940639149999996 ZT12-15 19.3486577895 6.9153885235 31.7819270555 ZT16-19 4.157084654 2.472537542 5.841631766 ZT20-23 1.903736 1.6298082209999998 2.1776637790000004