condition mean min max ZT0-3 10.353092 10.353092 10.353092 ZT4-7 9.656927499999998 9.656927499999998 9.656927499999998 ZT8-11 9.318491000000002 9.318491000000002 9.318491000000002 ZT12-15 8.9601635 8.9601635 8.9601635 ZT16-19 8.969928 8.969928 8.969928 ZT20-23 9.1799185 9.1799185 9.1799185