condition mean min max ZT0-3 0.796318 0.445278 1.0405255 ZT4-7 0.44240500000000005 0.44240500000000005 0.44240500000000005 ZT8-11 0.0 0.0 0.0 ZT12-15 1.03891475 1.035232 1.0425974999999998 ZT16-19 0.501735 0.501735 0.501735 ZT20-23 1.47925 1.47925 1.47925