condition mean min max ZT0-3 16.722502 16.722502 16.722502 ZT4-7 12.9914635 12.9914635 12.9914635 ZT8-11 14.292829999999999 14.292829999999999 14.292829999999999 ZT12-15 12.9656035 12.9656035 12.9656035 ZT16-19 10.934314 10.934314 10.934314 ZT20-23 10.589560500000001 10.589560500000001 10.589560500000001