condition mean min max ZT0-3 1.64619875 1.4803825 1.8120150000000002 ZT4-7 1.219822 1.219822 1.219822 ZT8-11 0.605664 0.605664 0.605664 ZT12-15 0 0 0 ZT16-19 1.186531 1.186531 1.186531 ZT20-23 1.63944 1.63944 1.63944