condition mean min max ZT0-3 886.602432 886.602432 886.602432 ZT4-7 188.71605599999998 188.71605599999998 188.71605599999998 ZT8-11 173.8562205 173.8562205 173.8562205 ZT12-15 368.15538150000003 368.15538150000003 368.15538150000003 ZT16-19 872.311953 872.311953 872.311953 ZT20-23 1303.96641 1303.96641 1303.96641