condition mean min max ZT0-3 10.120535 10.120535 10.120535 ZT4-7 9.587829 9.587829 9.587829 ZT8-11 10.414758500000001 10.414758500000001 10.414758500000001 ZT12-15 9.555875499999999 9.555875499999999 9.555875499999999 ZT16-19 10.472161 10.472161 10.472161 ZT20-23 10.8304955 10.8304955 10.8304955