condition mean min max ZT0-3 8.7164975 8.422635 9.01036 ZT4-7 9.746030000000001 9.746030000000001 9.746030000000001 ZT8-11 11.33085 11.33085 11.33085 ZT12-15 0 0 0 ZT16-19 7.64578 7.64578 7.64578 ZT20-23 9.078669999999999 9.078669999999999 9.078669999999999