condition mean min max ZT0-3 1.91886919275 1.8837140085000001 1.9540243769999999 ZT4-7 1.046145865 0.998287141 1.0940045889999999 ZT8-11 1.9552375505000001 1.3789673535000002 2.5315077475 ZT12-15 2.5551555185 2.5309417095 2.5793693275 ZT16-19 2.18472888 2.1725944185 2.1968633415000003 ZT20-23 2.2273279905 2.2011402980000003 2.2535156830000003