condition mean min max ZT0-3 19.331783333333334 8.80095 28.25975 ZT4-7 6.9595 6.9595 6.9595 ZT8-11 16.7017 16.7017 16.7017 ZT12-15 41.828575 40.8585 42.798649999999995 ZT16-19 44.6434 44.6434 44.6434 ZT20-23 44.0208 44.0208 44.0208