condition mean min max ZT0-3 0.4608255 0.2008505 0.788993 ZT4-7 0.141796 0.141796 0.141796 ZT8-11 0.3411685 0.3411685 0.3411685 ZT12-15 0.8754442499999999 0.854664 0.8962245 ZT16-19 1.293605 1.293605 1.293605 ZT20-23 0.8298464999999999 0.8298464999999999 0.8298464999999999