condition mean min max ZT0-3 57.74765 57.0124 58.4829 ZT4-7 47.376850000000005 47.376850000000005 47.376850000000005 ZT8-11 51.72435 51.72435 51.72435 ZT12-15 0 0 0 ZT16-19 68.3763 68.3763 68.3763 ZT20-23 71.7368 71.7368 71.7368