condition mean min max ZT0-3 628.466351 628.466351 628.466351 ZT4-7 660.8971885000001 660.8971885000001 660.8971885000001 ZT8-11 565.1907974999999 565.1907974999999 565.1907974999999 ZT12-15 640.6435455000001 640.6435455000001 640.6435455000001 ZT16-19 570.836854 570.836854 570.836854 ZT20-23 470.00744050000003 470.00744050000003 470.00744050000003