condition mean min max ZT0-3 4.4722124999999995 2.718285 6.22614 ZT4-7 27.9658 27.9658 27.9658 ZT8-11 24.23515 24.23515 24.23515 ZT12-15 0 0 0 ZT16-19 4.15637 4.15637 4.15637 ZT20-23 5.67502 5.67502 5.67502