condition mean min max ZT0-3 0.011530390500000001 0.0 0.023060781000000002 ZT4-7 0.10829610475000001 0.10111947800000001 0.11547273150000001 ZT8-11 0.15435941074999998 0.12715387 0.1815649515 ZT12-15 0.099795823 0.043705733499999996 0.1558859125 ZT16-19 0.17367232575000002 0.171956138 0.1753885135 ZT20-23 0.26327038174999995 0.26322569799999995 0.26331506549999995