condition mean min max ZT0-3 86.3776 82.60595 90.85640000000001 ZT4-7 93.488 93.488 93.488 ZT8-11 30.902250000000002 30.902250000000002 30.902250000000002 ZT12-15 12.0879425 9.335185 14.8407 ZT16-19 23.037550000000003 23.037550000000003 23.037550000000003 ZT20-23 28.455000000000002 28.455000000000002 28.455000000000002