condition mean min max ZT0-3 160.704325 103.97665 217.43200000000002 ZT4-7 72.3455 72.3455 72.3455 ZT8-11 29.980249999999998 29.980249999999998 29.980249999999998 ZT12-15 0 0 0 ZT16-19 59.733399999999996 59.733399999999996 59.733399999999996 ZT20-23 144.625 144.625 144.625