condition mean min max ZT0-3 4.177960000000001 3.681985 4.673935 ZT4-7 3.277965 3.277965 3.277965 ZT8-11 5.277844999999999 5.277844999999999 5.277844999999999 ZT12-15 0 0 0 ZT16-19 5.804285 5.804285 5.804285 ZT20-23 4.504659999999999 4.504659999999999 4.504659999999999