condition mean min max ZT0-3 11.437225383 7.894360866 14.9800899 ZT4-7 19.506397970000002 18.81320061 20.19959533 ZT8-11 21.51758849 20.74915879 22.28601819 ZT12-15 24.264570340000002 21.357196520000002 27.171944160000002 ZT16-19 29.505808837500002 24.36294815 34.648669525 ZT20-23 51.721978645 45.08781291 58.35614438