condition mean min max ZT0-3 7.52139 7.41704 7.62574 ZT4-7 5.006455000000001 5.006455000000001 5.006455000000001 ZT8-11 3.70908 3.70908 3.70908 ZT12-15 0 0 0 ZT16-19 6.581300000000001 6.581300000000001 6.581300000000001 ZT20-23 7.16551 7.16551 7.16551