condition mean min max ZT0-3 0.9854890000000001 0.9854890000000001 0.9854890000000001 ZT4-7 1.13154 1.13154 1.13154 ZT8-11 0.6741455000000001 0.6741455000000001 0.6741455000000001 ZT12-15 0.539586 0.539586 0.539586 ZT16-19 1.0011856666666668 1.0011856666666668 1.0011856666666668 ZT20-23 0.8894179999999999 0.8894179999999999 0.8894179999999999