condition mean min max ZT0-3 4.3242975 3.561305 5.087289999999999 ZT4-7 11.163415 11.163415 11.163415 ZT8-11 22.1878 22.1878 22.1878 ZT12-15 0 0 0 ZT16-19 8.676575 8.676575 8.676575 ZT20-23 7.411255 7.411255 7.411255