condition mean min max ZT0-3 8.440125 5.8374 11.04285 ZT4-7 7.715695 7.715695 7.715695 ZT8-11 3.47767 3.47767 3.47767 ZT12-15 0 0 0 ZT16-19 10.76384 10.76384 10.76384 ZT20-23 2.18486 2.18486 2.18486