condition mean min max ZT0-3 9.4410119655 8.045733641 10.83629029 ZT4-7 8.948094081499999 7.969164344499999 9.9270238185 ZT8-11 9.9614061865 8.672218158 11.250594215 ZT12-15 13.2658554785 11.054605582 15.477105375 ZT16-19 18.61450726 14.911901790000002 22.317112729999998 ZT20-23 11.801416241750001 9.3835442935 14.21928819