condition mean min max ZT0-3 3.5132575000000004 2.9168250000000002 4.1096900000000005 ZT4-7 1.797765 1.797765 1.797765 ZT8-11 1.43281 1.43281 1.43281 ZT12-15 0 0 0 ZT16-19 2.051885 2.051885 2.051885 ZT20-23 3.2061349999999997 3.2061349999999997 3.2061349999999997