condition mean min max ZT0-3 9.242799999999999 8.136535 10.00207 ZT4-7 16.4005 16.4005 16.4005 ZT8-11 60.51425 60.51425 60.51425 ZT12-15 52.17400000000001 35.007000000000005 69.34100000000001 ZT16-19 27.31125 27.31125 27.31125 ZT20-23 20.8209 20.8209 20.8209