condition mean min max ZT0-3 0.3097538833333333 0.04930965 0.516282 ZT4-7 0.34541350000000004 0.34541350000000004 0.34541350000000004 ZT8-11 0.304577 0.304577 0.304577 ZT12-15 0.44768050000000004 0.37307 0.5222910000000001 ZT16-19 0.533871 0.533871 0.533871 ZT20-23 0.213941 0.213941 0.213941