condition mean min max ZT0-3 12.124175000000001 11.094550000000002 13.1538 ZT4-7 14.946950000000001 14.946950000000001 14.946950000000001 ZT8-11 26.4972 26.4972 26.4972 ZT12-15 0 0 0 ZT16-19 20.23285 20.23285 20.23285 ZT20-23 19.40225 19.40225 19.40225