condition mean min max ZT0-3 0.519859 0.340747 0.7525124999999999 ZT4-7 0.43406449999999996 0.43406449999999996 0.43406449999999996 ZT8-11 0.1867005 0.1867005 0.1867005 ZT12-15 0.42396625 0.306083 0.5418495 ZT16-19 0.6013385 0.6013385 0.6013385 ZT20-23 0.23729905 0.23729905 0.23729905