condition mean min max ZT0-3 9.412655 9.16602 9.65929 ZT4-7 11.05575 11.05575 11.05575 ZT8-11 9.402470000000001 9.402470000000001 9.402470000000001 ZT12-15 0 0 0 ZT16-19 9.63081 9.63081 9.63081 ZT20-23 13.55905 13.55905 13.55905