condition mean min max ZT0-3 2.0119599999999997 1.8167049999999998 2.2072149999999997 ZT4-7 2.569385 2.569385 2.569385 ZT8-11 2.572475 2.572475 2.572475 ZT12-15 0 0 0 ZT16-19 3.993235 3.993235 3.993235 ZT20-23 4.012 4.012 4.012