condition mean min max ZT0-3 3.382545 2.8427949999999997 3.922295 ZT4-7 3.6223650000000003 3.6223650000000003 3.6223650000000003 ZT8-11 2.8741 2.8741 2.8741 ZT12-15 0 0 0 ZT16-19 4.07699 4.07699 4.07699 ZT20-23 3.1555999999999997 3.1555999999999997 3.1555999999999997