condition mean min max ZT0-3 69.6429 67.08699999999999 73.94030000000001 ZT4-7 49.03855 49.03855 49.03855 ZT8-11 38.049350000000004 38.049350000000004 38.049350000000004 ZT12-15 44.805825 41.592150000000004 48.0195 ZT16-19 42.5777 42.5777 42.5777 ZT20-23 52.0334 52.0334 52.0334