condition mean min max ZT0-3 3.05655371725 3.0495868455000004 3.063520589 ZT4-7 1.84981627725 1.7193771039999999 1.9802554505 ZT8-11 2.6960202895 2.245342033 3.146698546 ZT12-15 3.1665240052500003 3.1239658655 3.209082145 ZT16-19 2.52293301375 2.3371636825 2.708702345 ZT20-23 4.4072843565 4.007445634 4.807123079