condition mean min max ZT0-3 0.7250380000000001 0.7250380000000001 0.7250380000000001 ZT4-7 0.40608449999999996 0.40608449999999996 0.40608449999999996 ZT8-11 1.618765 1.618765 1.618765 ZT12-15 7.2688500000000005 7.2688500000000005 7.2688500000000005 ZT16-19 8.172593333333333 8.172593333333333 8.172593333333333 ZT20-23 2.21543 2.21543 2.21543