condition mean min max ZT0-3 24.310299999999998 24.310299999999998 24.310299999999998 ZT4-7 13.36825 13.36825 13.36825 ZT8-11 12.70325 12.70325 12.70325 ZT12-15 20.677599999999998 20.677599999999998 20.677599999999998 ZT16-19 30.595350000000003 30.595350000000003 30.595350000000003 ZT20-23 31.85095 31.85095 31.85095