condition mean min max ZT0-3 0.31157 0.29286449999999997 0.3302755 ZT4-7 0.5824215 0.5824215 0.5824215 ZT8-11 1.67192 1.67192 1.67192 ZT12-15 0 0 0 ZT16-19 2.05614 2.05614 2.05614 ZT20-23 1.3234599999999999 1.3234599999999999 1.3234599999999999