condition mean min max ZT0-3 2.710805 2.710805 2.710805 ZT4-7 2.062495 2.062495 2.062495 ZT8-11 2.38862 2.38862 2.38862 ZT12-15 2.5659850000000004 2.5659850000000004 2.5659850000000004 ZT16-19 3.153565 3.153565 3.153565 ZT20-23 2.599085 2.599085 2.599085