condition mean min max ZT0-3 18.471625456666665 15.39618149 21.547069423333333 ZT4-7 29.735471600000004 27.42618244 32.04476076 ZT8-11 39.99887754833333 37.341467996666665 42.6562871 ZT12-15 32.02715795 28.753717650000002 35.30059825 ZT16-19 30.167076344999998 29.20558027 31.12857242 ZT20-23 26.86770802 26.00958040333333 27.725835636666666