condition mean min max ZT0-3 3.22507142125 2.6819607745000003 3.768182068 ZT4-7 0.772573502 0.6965160284999999 0.8486309755 ZT8-11 1.0517896439999999 0.8865808095 1.2169984784999999 ZT12-15 1.41194449775 1.256236557 1.5676524385 ZT16-19 0.9474786737500001 0.77488072 1.1200766275 ZT20-23 2.1965995019999998 1.7039149755 2.6892840285