condition mean min max ZT0-3 20.829133333333335 13.136800000000001 27.25065 ZT4-7 10.857299999999999 10.857299999999999 10.857299999999999 ZT8-11 12.256695 12.256695 12.256695 ZT12-15 15.697949999999999 12.81075 18.58515 ZT16-19 12.4916 12.4916 12.4916 ZT20-23 17.544600000000003 17.544600000000003 17.544600000000003