condition mean min max ZT0-3 10.167196 10.167196 10.167196 ZT4-7 9.540404500000001 9.540404500000001 9.540404500000001 ZT8-11 9.6576065 9.6576065 9.6576065 ZT12-15 9.987815000000001 9.987815000000001 9.987815000000001 ZT16-19 9.074819 9.074819 9.074819 ZT20-23 9.688244999999998 9.688244999999998 9.688244999999998