condition mean min max ZT0-3 33.499764 33.499764 33.499764 ZT4-7 31.903257500000002 31.903257500000002 31.903257500000002 ZT8-11 30.933754999999998 30.933754999999998 30.933754999999998 ZT12-15 36.307539 36.307539 36.307539 ZT16-19 31.630315500000002 31.630315500000002 31.630315500000002 ZT20-23 43.3528285 43.3528285 43.3528285