condition mean min max ZT0-3 40.4793 39.9259 41.032700000000006 ZT4-7 19.287300000000002 19.287300000000002 19.287300000000002 ZT8-11 23.264499999999998 23.264499999999998 23.264499999999998 ZT12-15 0 0 0 ZT16-19 24.80005 24.80005 24.80005 ZT20-23 31.26425 31.26425 31.26425