condition mean min max ZT0-3 28.095048480000003 22.1472655 34.04283146 ZT4-7 36.863112282 12.405608094 61.320616470000004 ZT8-11 6.931330331666667 6.304168224333333 7.558492439 ZT12-15 6.256819256166667 5.713543393666667 6.8000951186666665 ZT16-19 6.16079811 5.7436774779999995 6.5779187420000005 ZT20-23 7.649533633166666 6.818583924333333 8.480483342