condition mean min max ZT0-3 3.0784075 2.2627 3.894115 ZT4-7 3.7911149999999996 3.7911149999999996 3.7911149999999996 ZT8-11 3.6896700000000004 3.6896700000000004 3.6896700000000004 ZT12-15 0 0 0 ZT16-19 6.11374 6.11374 6.11374 ZT20-23 4.84338 4.84338 4.84338