condition mean min max ZT0-3 2.3498349999999997 2.3498349999999997 2.3498349999999997 ZT4-7 3.52962 3.52962 3.52962 ZT8-11 1.65565 1.65565 1.65565 ZT12-15 0.7392354999999999 0.7392354999999999 0.7392354999999999 ZT16-19 0.6472415 0.6472415 0.6472415 ZT20-23 1.476025 1.476025 1.476025